When a pregnancy test will show the correct result: a comment by a gynecologist

12/26/2017 Diagnosis of pregnancy Pregnancy is an amazing period in the life of every woman, when a new life is born and develops in you. Her onset is always unexpected, even if the baby is waiting impatiently - not every ovulation ends with the fertilization of the egg.

All women should know how long a pregnancy test shows, although there is disagreement about this. At the first symptoms and new sensations, you need to go to the pharmacy for a test.

But it is important to use it correctly so that there is no false result.

How does he work

This method of self-diagnosis is common among modern women. The main advantages of testing are:

  • low price
  • availability,
  • ease of use
  • anonymity,
  • reliable result.

To have an idea of ​​when to do a pregnancy test, you need to understand the principle of its work. Any such device is programmed to search for a specific structure - chorionic gonadotropin. This substance begins to be produced by the female body immediately after the attachment of the fetal egg to the cavity of the genital organ. At first, the concentration of the unique hormone rises in the blood. Some time after implantation, it begins to increase in the urine. It is during this period that it is better to do a test in order to quickly learn about the new situation.

Take a short online pregnancy test on our website in a couple of minutes and get the answer - are you pregnant or not.

When chorionic gonadotropin is detected, strip strips show a reagent. As a result of this, a woman sees a positive result - two lines. When there is no pregnancy hormone in the urine or its concentration is still not high enough, the device shows one line - the control. It indicates that the study was conducted correctly.

What is the effect of the tests based on?

Entering sexual life, each girl should have basic knowledge about her reproductive system and how and when conception occurs. In many women's forums, one of the most popular topics remains “from what time frame the pregnancy test shows”, which indicates a total lack of awareness. It would seem that physiology was studied at school, there is a lot of information around us on the “amniotic” topic, but there are obvious gaps in elementary knowledge.

To answer your question, what is the minimum period a pregnancy test shows, it is important to understand how the test works and what it responds to. How is the response of the “two-lane friend of girls” formed? Why do two different tests tested on the same morning give opposite answers? Who is to blame for the errors of the test strips? Let's understand in detail.

Buying a test at the pharmacy (or several indicators of different types), each of us hopes to get an accurate answer. All of them have different sensitivity, respectively, different "veracity" in the early stages. They can respond both to a sufficient concentration of the “hormone of the pregnant woman” and to residual effects from the previous fetus after an abortion or miscarriage.

An indicator that responds to chorion secretion (the forming placental membrane of the embryo) can recognize other hormone-like substances. For example, the test does not distinguish between hormone-like molecules produced by cancerous tumors. In this case, there is a weak strip. So sometimes a pregnancy test is wrong, which shows the gestational age in the form of numbers. But it is difficult to say without a full examination - it is an embryo or a tumor.

Pharmacies offer a large assortment of tests from different manufacturers. But all of them are classic or advanced versions of a simple litmus known from school chemical experiments. Protein reagent is applied on a different basis:

  1. Paper.
  2. The matrix.
  3. Plastic window.
They have one goal - to identify molecules of human chorionic gonadotropin or hCG. But in the blood and urine in the first day after conception there will be a small concentration of this substance. It depends on whether the ultra-sensitive test shows a long-term pregnancy or is not able to detect this hormone.

Every expectant mother gradually increases the level of this biological compound - from 0 to 10 mU / ml and higher. Starting at this level, test systems begin to recognize the discharge of chorion tissue as soon as the fetal egg is fixed in the uterine endometrium. The difference between the tests is in the threshold of sensitivity to hCG, which is detected in two ways:

  • using a laboratory blood test (in the clinic),
  • with self-diagnosis by a pharmaceutical test based on urine.
In any case, it is important to listen to other signals of your body, so as not to be mistaken. But the final “verdict” will be told by the gynecologist, not a test, no matter how “accurate” it is, according to statistics and the manufacturer’s promises on the package.

Urinary HCG

In a non-pregnant state, the level of hCG in the blood does not exceed 2-3 IU. In urine, this amount is even less. Immediately after implantation, which occurs 3-7 days after the release of the egg, the number of pregnant indicators begins to increase. Daily it increases by 1.5-2 times. How many days after conception the test will show pregnancy, it will help to approximately determine the table of HCG norm in urine.

In this table, you can see what is the content of hCG by the day from conception in urine.

Keep in mind the fact that the moment of sexual contact does not always coincide with ovulation. Sperm can exist in the body of a woman up to 7 days. For this reason, it is necessary to count down precisely from the day the egg is released from the ovary. You can reliably determine the moment of ovulation using appropriate tests, measuring basal temperature or by ultrasound.

What does the test respond to?

To understand when it is advisable to conduct a pregnancy test and from what time period it shows an accurate positive result, you need to know how it works, so that it "formulates its answer."

The only purpose for which a woman performs such a test is to obtain an accurate answer to her question about the presence / absence of pregnancy. It will not be possible to identify any pathologies or other changes in the body using such tests.

Any test, the options of which are filled with every pharmacy, works due to its “programming” to detect the fact that there is an increased content of the hormone in the blood, known to everyone as hCG (its full name is “chronic human gonadotropin”). This substance is accepted both in the people, and in medical practice to name "pregnancy hormone".

Any test works due to its “programmedness” to identify the fact of the presence of an increased content of the hormone in the blood, known to everyone as hCG (its full name is “chronic human gonadotropin”)

In the female body in a state where pregnancy is not observed, the proportion of hCG is estimated by an indicator in the range from 0 to 10 mU / ml. Such a concentration of it in the blood also remains during the first week after the nimble sperm managed to fertilize the egg, reaching the upper mark from the indicated range. Only the hypersensitive test is able to respond to the upper threshold (10 mU / ml) of this blood saturating substance.

From the period of ovulation and presumptive fertilization to the final attachment of the embryo to the intrauterine endometrium, often at least seven to ten days pass. And from this very cherished moment, the content of hCG in the blood begins to increase. Most modern tests are capable of recognizing an indicator of 20 mU / ml or even more. And he, in turn, is reached in the blood not earlier than two weeks after the fertilization of the female egg. If you count on the cycle calendar, this time corresponds to the period when the next menstruation should begin. If she does not come, it is customary to talk about the delay as the first bell announcing that it is time to do a pregnancy test.

“Pregnant Hormone” is typically excreted from the female body as part of urine. Therefore, all pregnancy tests carried out at home are based on contact with female urine to determine the result. Each test strip is treated with a special reagent, which makes it sensitive to this hormone.

“Pregnant Hormone” is typically excreted from the female body as part of urine. Therefore, all pregnancy tests performed at home are based on contact with female urine to determine the result.

Advice!Women conducting a pregnancy test should be careful and carefully consider the result obtained on the test strip. Sometimes the second line appears barely. This often happens when the test is carried out before the delay of menstruation, and hCG is present in the body in a small dose.

How does a test detect pregnancy?

In a home pregnancy test, the chemical compounds contained in the test reveal the content of chorionic gonadotropin (hCG) in urine. This is one of the gonadotropins that begins to be produced after fertilization.

HCG (HCG) is a gonadotropin, which in its structure is similar to other gonadotropins, FSH and LH are follicle-stimulating and luteinizing.

How long can pregnancy be determined? HCG is secreted by the chorion after implantation of a blastocyst in the endometrium, 5-7 days after fertilization. However, its concentration reaches the desired value for the test 2-3 weeks after conception.

In some cases, a pregnancy test may give false positives. HCG increases with tumors of the ovaries and uterus, digestive organs, respiratory system and kidneys, and chorionocarcinoma.

How long will the test show a positive result

All women ask questions - after how much you can do a pregnancy test if there is a delay in menstruation, and how to find out that the result is correct. What is better to use when checking. Can fertility be checked early on?

A woman already knows in advance that surprises can await her. But be that as it may, everyone wants to know how much the pregnancy test will show.

Medicine does not stand still and offers women to know the conception and offers many opportunities. The most common are pregnancy tests, which allow you to check and determine whether there are conceptions or not.

Women, as a rule, do not know when the test shows pregnancy. It often happens that they try to carry it out several days after sexual intercourse, and seeing negative results calm down. But in vain, the definition of conception in the early stages will not be correct, and you can check whether the result is positive or not in a few days.

After the first sexual intercourse, the test will not show any changes and the emergence of a new life. A pregnancy test in the early stages may show some result, with minor delays in menstruation. Immediately after the first unprotected act, the test will not show the result, so it is worth checking a little later.

All tests work on the same principle - a fairly simple indicator that allows you to perform this procedure at home and immediately find out and check the result. How long the test will show pregnancy depends on the manufacturer's company, on the test itself, its features, and which one is better to use, we will consider further.

Therefore, doctors say that for a more accurate result, it is better to use several different tests. This will correctly identify and analyze. In the early periods of monthly delay, the effectiveness of determination is almost 99 percent. This analysis can be done at home and in clinics. Therefore, after the first result, it is worth checking again.

If all tests show a positive result, then the conception has come to pass. It must be remembered that after the first violation and delay of menstruation are not fertilization of the uterus, it is worth a little wait. This will allow you to better find out whether the result is accurate, and then check again.

In order to understand at what period to do the test, so that the result is as true as possible, you need to clarify what exactly it determines. How to use the test is written in each instruction.

The test is a small thin strip, a special reagent is applied to it. When the strip is immersed in urine, the reagent itself gets wet and changes color. But on the test, the second bar appears when:

  • The level of the hormone rises.
  • Chorionic gonadotropin is determined.

How do tests work?

To understand how long a pregnancy test is reliable, you need to know the principle of its work. The main task is to recognize in a woman’s urine the “pregnancy hormone”, or its medical name is chorionic gonadotropin (hCG). Its development begins only after the conception has occurred and the embryo has been fixed in the uterus. It is generally accepted that in a woman’s urine, when she is not pregnant, contains 0-10 mU / ml.

The most sensitive tests can detect the presence of hCG only if its value is higher than 10 mU / ml. If you lower this boundary, the result can be positive even in a healthy non-pregnant woman. For this reason, tests do not have higher sensitivity.

What test to use?

Today, when it comes to pregnancy tests, we mean special pharmacy devices of one of such common varieties:

Strip strips are now considered the most “running” and cheapest option for quick pregnancy detection. They are ready to show the result within five minutes after testing. And it is carried out in this way: a portion of morning urine is collected in a tank, into which a test strip is immersed to the marked limit for only a couple of seconds. These tests respond to a concentration of “pregnancy hormone” of no lower than 20 mU / ml. And then often a little higher.

The test of a tablet type is similar to a box on which a pair of "windows" is placed. Urine should be dripped into one of them, and the answer to the cherished question: one or two strips, will appear in the other as a result of a chemical reaction. For convenience, they occupy the highest rung compared to the previous version, and are approximately equal in sensitivity.

The test of a tablet type is similar to a box on which a pair of "windows" is placed. Urine should be dripped in one of them, and in the other, as a result of a chemical reaction, the answer to the treasured question will appear: one or two strips

Inkjet tests are more sensitive. The instruction to them says that they will “work” even if there is hCG in the body of the lucky - the future mother, at the level of 10 mU / ml. It is not necessary to wait in the early morning to carry out the procedure. At any time of the day or night, placing the device under the stream of urine, you can verify (or vice versa) your assumptions regarding the onset of pregnancy.

Thanks to the progress of science and technology, high-precision digital tests have appeared today, which are able not only to maximally correctly indicate the presence of pregnancy, but also using a special indicator to clearly indicate the period for which the expectant mother is staying. The accuracy of this test is equivalent to an ultrasound test. But the cost of such "pleasure" is high.

Advice!Choosing a test, you need to focus not so much on the cost and convenience of the procedure, but on the period for which you plan to conduct it, based on the capabilities and accuracy of each type of test.

How long can pregnancy be determined?

All hormones, in one concentration or another, are present in the blood and urine. “Pregnant Hormone” is filtered by the kidneys, like other compounds, after which it is excreted from the woman’s body. Therefore, it is determined in the composition of urine, and its concentration does not “roll over”. All tests work to determine this concentration.

Important: For most systems, the minimum threshold is unavailable, they can "try out" hCG from 20 mU / ml, below occasionally. Therefore, at an early stage (before the delay), ask the pharmacy for only an ultra-sensitive test for pregnant women.

So how long does a pregnancy test determine? As soon as the concentration of hCG reaches the minimum threshold of sensitivity - 10 mU / ml. After the egg and the sperm merge on the journey of an actively growing embryo to the place of implantation in the uterus, it takes about 1-2 weeks, then the chorion actively develops and releases its hormone.

If the fetal egg is stuck in the fallopian tubes (this is rare), the hormonal background is uncertain. With an ectopic pregnancy, the strip is weak or does not indicate pregnancy. But, it is quite possible that everything is normal, the concentration of the “control substance” is simply not high. There are doubts - to check with a "beloved doctor."

The travel time of the ovum to the uterus approximately coincides with the delay. But the interval between the next menstruation in women (girls) is different - from 22 to 36 days. It is even more difficult to determine the timing when the monthly irregular, hormonal ph "jumps" and for a long time can not get pregnant. Therefore, you should not buy a test earlier than two weeks from ovulation (the exit of a mature egg from the follicle).

Caution: It is good when there is accurate data on the days of ovulation in your body. Therefore, it is important to note the cyclical nature in a special calendar. These data will be useful both for productive fertilization and for natural protection.

What is the minimum term for pregnancy? Most tests are still able to give a reliable result at a sensitivity threshold of about 20 mU / ml (in urine and blood). This level of concentration reaches approximately 12-14 days after fertilization.

So, if you expect menstruation, but it is not there - buy a test and find out the reason for the delay. You will be lucky if you can buy an ultra-sensitive electronic test that will answer the mini-panel “pregnon” (pregnant) or “non pregnon” (not pregnant) on days 7-10. In any case, all pregnant women, with an interval of several days, are tested again, buying different tests.

What rules must be followed in order for the pregnancy test results to be correct?

According to studies, tests in 97-99% of cases show reliable information. However, there is still little chance that the results will be false. To avoid such an unpleasant situation, you need to know several important rules.

  • It makes no sense to check for pregnancy immediately the very next day after possible fertilization. The level of hCG at this period does not increase, so there will definitely not be a true result. In this case, most likely, there will be a negative result, even if pregnancy is available.
  • It is advisable to use morning urine. The highest concentration of hCG in the blood is in morning urine. If the gestational age is already high enough, for example, if it has already passed 6-7 days after the delay, then the test can be done at any time of the day. At this period, the level of pregnancy hormone is already quite high.
  • You can read the result from the test within five minutes after it. If much more time has passed, the results will be invalid.
  • HCG levels can also be checked with blood. In order for the result to be true before donating blood, you should not use any medications.
  • Diagnosis can only be made with fresh urine, that is, with urine that was collected on the day the test was performed.
  • In about 2-3 hours, it is not advisable to eat watermelon or any diuretic. The fact is that strongly diluted urine can show incorrect results and the accuracy of the result is in doubt.
  • In order for the urine to concentrate well, it is not advisable to visit the toilet for 3 hours before.

The most sensitive tests

How many days the test will show pregnancy after conception - depends entirely on its sensitivity. Modern manufacturers of research instruments promise 99% diagnostic accuracy even before the delay. However, loud slogans and promising statements should not be believed. You need to understand the test systems to know how long to use this or that.

The sole purpose of non-pregnancy tests is to detect chorionic gonadotropin in research material. On what day after conception it will be installed - depends on the sensitivity of the system. All device specifications are indicated on the packaging. Running tests are with a sensitivity of 20 and 25 mUl / ml, but strips with a value of 10, 15 and 30 can also be purchased. This figure shows the minimum level of chorionic gonadotropin, which is necessary to establish a new position.

  • EVA is a test that refers to insensitive but accurate devices. It determines pregnancy when at least 30 mU of hCG is present in the urine, which means that the probability of a false-positive result is quite small for them.
  • Itest, Vera, Mon Ami, Frautest have a sensitivity of 25 IU. Such tests are the most popular.
  • Lady, Evitest, Mama Check with a sensitivity of 20 mU allow pregnancy to be determined 1.5-2 weeks after conception. However, before the delay, they still sometimes give a false result.
  • Insure, Clever Girl, who catch a reading of 12.5 mU hCG in urine, give an early result. According to the promises of manufacturers, they show two strips a week after ovulation.
  • BB test, First Sign position themselves as highly sensitive tests. They react when the level of a pregnant hormone in the urine reaches 10 IU. According to reviews, such devices often show a false positive result.

On what day after the proposed conception does it make sense to do a test?

All pregnancy tests recognize HCG in urine, so it makes no sense to check its occurrence the day after an unprotected intimate act, because HCG begins to be secreted after blastocyst implantation.

Test strips are not used until the time when the delay. Tablet and electronic tests can recognize pregnancy 3-5 days before the delay, or 23-25 ​​days of the cycle.

  • 9-10 days after coition - the probability of the correct result is 50%,
  • by 10–11 - 84%,
  • 11-12 - 92%,
  • on the day of delay and later - 99%.

Calculate your gestational age using a calculator:

What happens at conception

As mentioned earlier, the conception that occurred at first can only be determined by the presence of hCG hormone in the urine or blood. It begins to be produced not after fertilization itself, but only when the embryo is fixed in the uterus. This is carried out after about 7-8 days from the date of conception. This period of time is necessary to move the embryo through the fallopian tube into the uterine cavity. In addition, it should be noted that the egg can be fertilized only after a couple of days after the sexual act.

Early pregnancy tests are more likely to be indicative only 14 days after fertilization. It is recommended to conduct a study at least from the very first day of waiting for menstruation.

The amount of produced hCG hormone increases quite rapidly - about 1.6 - 2 times per day. Accordingly, the later the study is conducted, the more accurate its results will be.

The principle of pregnancy tests

The basis of any test is simple indicators that make it easy to find out about your possible interesting situation at home. What day of pregnancy the test shows the correct result depends on the test itself, its features, manufacturer company and quality. The effectiveness of tests in the initial stages is from 97 to 99%, therefore, if the determining device is not defective, the result of the study will be reliable in most cases. However, it is recommended to purchase 2-3 different tests to confirm the results, especially at the earliest dates, and apply them strictly following the instructions.

To know exactly how long to apply a pregnancy test so as to get the most reliable result, you need to find out what it determines. The simplest pregnancy test is a small thin strip of the canton, in a certain place of which a special reagent is applied. When the strip is immersed in the urine, the reagent becomes wet and changes color, while the second line on the test appears when there is an increased level of pregnancy hormone in the urine called chorionic gonadotropin, the production of which in the woman’s body begins immediately as soon as conception has occurred, increasing every day until a certain date.

With many modern tests that have high sensitivity, you can conduct a study even before the delay of the next menstruation, in the very early stages of the condition, but, of course, not 1-2 days after unprotected intercourse. Pregnancy hormone begins to be produced already in the first week, but its concentration during this period is very small and will be insufficient for research, however, over the next week and beyond, the level of hCG will increase by a thousand times. Read more about conducting a pregnancy test before a delay →

How to choose a suitable test?

Pregnancy tests offered in the pharmacy network are divided into how many varieties:

  • jet,
  • tablet
  • strip strips
  • electronic (digital).
The most affordable and popular is the “striped friend of girls”, men know about them. If you send your husband or friend for a similar “device” to the pharmacy, for sure, he will buy exactly the “two strips”. The most advanced husbands can ask the pharmacist “what's the difference?” And listen to a short “sermon” about the most expensive and accurate tests. Most likely, in this case, he will buy digital, and not the cheapest - strip strips.

In order for such a test to “streak”, it needs to be lowered into a container where morning urine is collected - it has the highest concentration of hCG. Results will be in 5-10 minutes. If the test does not appear next to the control strip, the second one is exactly the same in width and color - you are not pregnant.

How long can I learn about pregnancy with a striped test? Unfortunately, they do not have much sensitivity. In the best case, during a delay or later, when the concentration of the control hormone rises to a level above 20 ppm / ml.

A tablet test is the same case where you need to instill urine (a pipette is included). The sensitive reagent is located in a special window, where the control "dose" of urine should go. A chemical reaction occurs rather quickly. These tests are convenient and accurate, but the degree of sensitivity is about the same as the more primitive “dipped” counterpart, they do not know the gestational age.

Specialists consider jet tests to be the most sensitive. It has nothing to do with inkjet printers or other devices. They just need to be substituted under a fresh stream of urine.

Attention: If you see the designation “10 honey / ml” on their packaging, be aware that this is a highly sensitive system. Their error is minimal, an undoubted advantage - application in any conditions. How long can a pregnancy be recognized? Until the delay.

Do manufacturers believe?

Many manufacturers of home diagnostic devices use a marketing move and indicate on the packaging of their product the exact figure on which day of conception a pregnancy test will show a positive result. In a pharmacy or supermarket, you can purchase systems that promise an accurate answer 1, 2, 4, or even 8 days before the delay. In fact, such statements cannot be trusted. The lower the sensitivity figure of the device, the less it needs hCG to establish pregnancy, the earlier - according to the manufacturer - the test will show. Most gynecologists recommend conducting a study no earlier than the first day of the delay. In this case, the result will be the most accurate.

Before the delay of menstruation, many women have a positive result. This is evidenced by their reviews. But often the device gives a negative answer, when after a while the pregnancy is still confirmed. The cause of a false negative result is an insufficient increase in hCG or improper use of the test. A false positive response is less common. Its causes may be internal diseases, for example, tumors. If the test shows 2 lines, but the woman is definitely not pregnant, then she needs to be examined.

Comments on the obstetrician-gynecologist, doctor of higher category, candidate of medical sciences, director of the family clinic "Repromed" Elena Kanaeva:

- Embryo implantation usually occurs on the 21-24th day of the cycle, the secretion of hormones reflecting the onset of pregnancy (hCG) begins during the first days after fertilization, but the concentration before implantation and the first stages of the development of trophoblast (future placenta) is too low to be detected during analysis (both blood and urine). Informative are the study of blood and urine for 3-4 days of delayed menstruation. Blood counts (hCG) have quantitative characteristics and therefore more accurately reflect the situation.

Including they are important for the differential diagnosis of uterine and ectopic pregnancy. The determination of serum hCG in the dynamics (with intervals of 2 weeks) is also important at a risk of regression of pregnancy.

Pregnancy tests (urinary) are also based on the detection of hCG, usually a qualitative study. For more accurate results, it is necessary to donate blood. In any case, it is advisable to consult a doctor if the pregnancy test is positive (or doubtful).

What could cause false test results?

  • Results may be false if a defective test was purchased. That is why in a pharmacy it is important to pay attention to the tightness of the package and its shelf life. If the test is even a little wet, then its results can be considered invalid.
  • Failure to follow the instructions on the packaging can also cause false results. Very often, women themselves are to blame for the fact that a pregnancy test shows incorrect results. It's all about the carelessness of women. Each packaging has instructions that must be carefully studied before use.
  • Women who take hCG drugs during the pregnancy test period also have a risk that the test will show incorrect results.
  • Drugs that are used for infertility often show pregnancy when it is actually gone.
  • The results can be false negative if the test used not morning, but daily urine in the early stages of pregnancy.
  • False positive results can occur if there is a residual hCG level in the blood after a recently terminated pregnancy.
  • False information can also be in the event that a woman suffers from diseases that are characterized by impaired growth and development of trophoblast.

If after the test the woman has suspicions that the results are false, then the doctors recommend making secure and buy another one. You need to try products from different manufacturers and seek help from specialists. If the test showed negative results, but the menstruation still does not start, then you should buy another one and again check for pregnancy.

Test strip or strip test

This species is probably the most popular and simplest, as well as the cheapest, but not having a high degree of sensitivity. The strip must be lowered into a container with urine for about 10 seconds, and then left on a flat surface for 5 minutes for a more accurate manifestation of the result. Two lines on the reagent strip will indicate the presence of pregnancy, one line indicates that the study itself was carried out correctly, but conception did not occur or the level of the hormone of pregnancy is below the required concentration.

Despite the high popularity of these strips, they have many shortcomings, for example, they can be overexposed in the collected urine or removed from there earlier than the set time, then the results can be unreliable. In addition, the reagent in such strips is most often applied to the paper layer (sometimes tissue), which may slightly determine the level of the hormone.

It makes sense to use such a test only on the first or second day of the delay of menstruation, since for the study the level of hCG should be at least 25 mIU / ml. At this time, the reliability of the strip will be approximately 90%. With a delay of one week, the percentage of pregnancy detection efficiency increases to 95-99%.

How to find out the gestational age using a household test?

Electronic or digital tests are considered the most accurate because they do not have phantom stripes or other obscure manifestations. If he recognizes a pregnancy, “+” or “pregnon” will be displayed. No hCG in the urine - “non pregnon” or just “-” will be written. A special indicator determines the concentration, respectively, will indicate the term of development of the fetus.

Important: Electronics with a minimum gestational age show the result of such a test, but they are much more expensive. If you want to know the duration of pregnancy, check with the pharmacy that you need a test that responds to the level of concentration of chorionic gonadotropin.

When a pregnancy test shows an inaccurate result

Any test, even the most accurate, may be wrong. According to studies, most tests are 95-99% reliable, and errors occur for various reasons. For example, an expired pregnancy test will show the correct result? Of course not, regardless of whether it shows “2 stripes” or “non pregnon”.

Often the girls themselves are to blame for not receiving what they should have. There is little chance of a false answer if the recommendations are not followed. Do everyone read the instructions before use? Most “know-it-alls” fall into funny situations - they dip the test case on the other side or substitute it under the stream when it was necessary to dig urine into the window.

There are two types of false pregnancy test responses:

  1. False positive.
  2. False Negative.
Strange, but some girls buy tests before an intimate date - it will be expired if "this night" comes much later. Why does the test show a negative result during pregnancy? For example, because it was used a second time or applied immediately after sexual intercourse. He is not designed for this.

When testing, it is preferable to use morning urine, it is useless to sleep before dinner, then go to the toilet, forgetting about the test. Then, if you eat watermelons all day and drink beer, greatly diluting your urine, the result will be “non pregnon” in a real pregnancy.

When to go for an ultrasound to determine pregnancy?

Registration in the antenatal clinic is not possible with one “tearing” test, even if there are 2 or 3 of them, and all are positive. So when you need to do an ultrasound to determine pregnancy? When there are signs of pregnancy, confirmed by pharmacy test systems.

Most girls, like fire, are afraid of visiting a gynecologist. But, in any case, it’s necessary to psychologically tune in to having to get into the “same” (hated) chair and undergo a visual examination of the genitals, then go for an ultrasound to determine pregnancy.

It will not do without taking a smear and blood for hCG to the laboratory of the clinic. A blood test will show the answer 13-14 days after PA, ultrasound is the final stage of confirmation of the fact of pregnancy. In the early stages, their accuracy is no more than 95%.

An ultrasound examination will also be scheduled to determine the location of the fetus and its size. With a referral from a doctor, you can make a free ultrasound to determine the pregnancy, if it is provided in your area.

Important: The level of “pregnancy hormone” in the blood should be checked on an empty stomach, after having stopped taking hormone-containing drugs or drugs that have hormone-like compounds of plant origin.

How long does an ultrasound determine pregnancy? Approximately from the second month, but there are two types of ultrasound examination:

  1. Abdominal ultrasound (external, with a sensor drive in the stomach, data is visible from the 5th week of pregnancy).
  2. A transvaginal ultrasound probe head is inserted into the vagina (it will give more accurate data, starting from 2-3 weeks of dividing a fertilized egg).

It became clear to girls (women) when to do the first ultrasound to determine pregnancy. But it is important to monitor your well-being, keep a calendar of menstruation, where to mark the days of ovulation (the middle of the cycle), in order to regulate the birth rate and plan pregnancy.

Tablet Type Test

The device has a fairly high cost in comparison with other types, but also a more advanced device for determining pregnancy. This type of test is usually used in many hospitals for professional tests. Its action is also based on the use of a reagent that interacts with the urine of a woman, but it has a high sensitivity.

There are two windows on the test device, in the first, using the attached pipette, you need to drop urine, and then wait for the result to appear in the second window. The level of pregnancy hormone for the test with such a device should be at least 10 mIU / ml, so the test is able to establish pregnancy at the very initial stages, sometimes even 1-2 days before the delay of menstruation.

How to get the exact result

When to do a pregnancy test, each woman decides for herself. If there is already a delay in menstruation, then the time of the diagnosis does not matter. When you want to do the test the very next day after conception, and you barely have the patience to wait 7-10 days after ovulation to examine the biomaterial for signs of pregnancy, you must adhere to certain rules:

  • choose morning time for testing (the first portion of urine after waking up contains a greater amount of chorionic gonadotropin, since its growth occurs mainly at night),
  • find a clean container for collecting material (if a tablet test or strip strip is used, the dishes should be clean, otherwise various liquid impurities can affect the result of the study),
  • observe the time (the instructions for use indicate not only when you can do a test for pregnancy, but also the time that you need to withstand the strip strip in the biomaterial),
  • correctly interpret the result (it is necessary to evaluate the test response within 3-5 minutes, most devices become uninformative after 10, and a reagent begins to appear on their surface).

Various violations can affect the result of the diagnosis. For example, if you use the test in the evening and before that drink a lot of water, then the answer will be distorted to the negative. For this reason, the manufacturers of all devices unanimously recommend to refrain from urinating 2-4 hours before the diagnosis, and also not to drink the liquid in this period of time. Under such conditions, urine will be more concentrated, which eliminates errors and false results.

How to choose?

Now there are a huge number of pregnancy tests. Some are more convenient, others less. The most common and cheapest are strip strips. They must be lowered into morning urine for a few seconds and then immediately removed and put on the table. Results can be seen in just a few minutes.

The most sensitive are inkjet tests. On their packaging there is a mark of 10 honey / ml and they can be done at any time of the day. The most expensive are electronic.

If you adhere to the rules and strictly follow all the tips, the pregnancy test will show only true information. Professionals argue that there is not much difference between the tests, so it is not always advisable to spend too much money on them.

Ink tests

A feature of such a device is that for their use it is not necessary to specifically collect urine in a container, it is enough to urinate on the receiving part of the device, which allows you to conduct research anywhere, even at work, just by visiting the toilet. The result of the study is displayed for 1 minute. The sensitivity of such tests is very high, hormone concentrations above 10 mMU / ml are sufficient to determine pregnancy, so such devices can show a reliable result several days before the expected delay.

What time to do the test

When to do a pregnancy test is not so important. If you follow all the rules, then after a delay, you can conduct research even in the evening or at night. It’s not necessary to wait for the morning urine. But it should be noted: the later the diagnosis is made, the greater the chances of getting an accurate answer.

Taking certain medications can also affect the result of testing. When planning pregnancy, women can be prescribed stimulation, which includes injections of chorionic gonadotropin. This substance is excreted from the body after about 2 weeks. Therefore, early testing can show a positive result with a real absence of pregnancy. Taking diuretics and certain medications to lower blood pressure speeds up the excretion of urine from the body, resulting in a decrease in the concentration of the pregnant hormone in the biomaterial.

To summarize, we can say with confidence that when it is better to do a pregnancy test, it is a few days after the delay. In this case, the result will be as accurate as possible, and the study can be carried out in the morning, afternoon or evening - as it is more convenient for a woman.

If patience is not enough, and you want to know about the conception held as soon as possible, then it is better to donate blood to determine hCG. This study will give a more accurate and earlier result. The analysis can be done already from 5-7 days after ovulation (not to be confused with sexual contact). It is important to understand how a pregnancy test works: from what period it shows - it depends on its sensitivity. The lower the ME value indicated on the package, the greater the chance of an early diagnosis.

Electronic digital test

It is the most expensive device of all presented on the modern market, but also the most understandable, since it shows an accurate and unambiguous result. The principle of its action is similar to other models, but the accuracy is as high as possible and may have a different percentage, depending on the day of pregnancy. When using such a test about 4 days before the expected delay, its accuracy will be about 51%. If applied 3 days before the start of menstruation, the accuracy increases to 82%, and in 2 days - up to 90%. The day before the next menstruation, the accuracy will be 95%, and on the first day of the delay, the information content of the test will be 99-100%.

There are several other tests that allow you to determine pregnancy at the initial stage before the expected delay of menstruation, they are called immunochromatographic. Their action is based on a general principle, but the sensitivity of determining pregnancy is higher. Such tests in most cases make it possible to establish the presence of pregnancy even when the level of the hormone in the urine is 10 mIU / ml, that is, from 7 days after the fertilization of the egg.

Types of tests:

  • Test strips. The most budgetary version of the study, showing a fairly reliable result, but when choosing such a test, you should pay attention to its sensitivity, which can range from 10 to 30 mIU / ml, the lower this figure on the package of the test, the sooner it can confirm or disprove the presence of pregnancy.
  • Ink tests. You can use this test anywhere and at any time of the day, using 7-10 days after the alleged fertilization, since their sensitivity is determined by the concentration of the hormone in the urine at 20 mI / ml. If you use such a device correctly and on time, then its reliability is 99%.
  • Tablet cassette test. Of all the devices that can determine pregnancy before the delay of menstruation, this particular type is considered the most reliable. Its sensitivity is 10 mIU / ml, which, when used correctly, can detect the presence of pregnancy from 7 days after the alleged fertilization.

On what day after intercourse the test can show pregnancy

Of course, any woman needs to know how long a pregnancy test shows the most reliable information. It is important to understand that the level of hCG hormone does not increase instantly, it happens gradually, and at the earliest stages in the blood its concentration will be much higher than in a woman’s urine. Pregnancy tests can determine its presence only when the level of the hormone reaches the necessary indicator, according to their sensitivity, which is different for each model.

As a rule, ordinary test strips are able to show a reliable result only on the first day of delayed menstruation, on average it is 11-15 days after ovulation. The higher the sensitivity of the test, the earlier you can use it to find out about a possible pregnancy. When using highly sensitive tests (from 10 mIU / ml), you can already find out about your position 5 days before the expected delay.

It is also necessary to take into account the reliability of the result, which in some cases can be false positive and false negative.

A false positive test result is quite common in a certain category of women for whom pregnancy becomes an obsession and the most cherished dream. They begin to look for any signs of pregnancy even in the most insignificant things, constantly staying in an excited nervous state, because of which menstruation delays often arise, giving rise to almost 100% confidence in pregnancy in them. At the same time, even in the normal state, a small amount of hCG may appear in the urine, which can stain the test indicator in a very pale color, which is perceived by women as confirmation of pregnancy, which in reality is not. This phenomenon is called false pregnancy in modern medicine.

A false negative result is also quite a common occurrence. It can be observed when in fact the pregnancy has come, but the test strips do not show this.This happens for a number of reasons, for example:

  • The test was applied at too short a period of pregnancy, when the level of the required hormone is still insufficient to accurately determine the condition.
  • There is a threat of termination of pregnancy immediately after conception.
  • The test is corrupted, applied incorrectly, or has a very poor quality.
  • A woman has a violation of the kidneys or cardiovascular system, which is why pregnancy hormone is not produced in the required amount.
  • If the pregnancy is intrauterine or frozen.
  • If the study was conducted without following the instructions with a violation of the process.
  • For analysis used diluted urine, not sterile containers.
  • The test was carried out after the use of diuretics or at the wrong time (day or late night).

With the normal development of pregnancy, almost all types of tests determine its presence reliably, if there were no violations of the instructions in the process of their use. And false-negative results of such studies are much less common than false-positive ones. If the woman is confident in the onset of pregnancy, and the test did not confirm this, the study should be repeated after a few days, when the concentration of the required hormone in the urine increases. If several tests show the presence of pregnancy, a woman should contact a medical center for medical confirmation and registration so that the baby is born healthy.

So when to carry out the procedure?

In this matter, you should focus on the following criteria:

  • “Abilities” of the acquired test device,
  • menstrual cycle day
  • the well-known dynamics of the increase in the concentration of "pregnancy hormone" in the blood.
About what specific period of delay of menstruation the test shows the onset of pregnancy, the instructions will tell him

So, if you have stocked with strip strips, tablet tests that are sensitive to hCG levels of 20 ppm / ml, then earlier than the second day of the onset of menstruation, you should not do this. The thing is that, as mentioned above, only two weeks after the fertilization of the egg, the level of the hCG hormone reaches such a threshold that the test can detect it. More precisely, on what specific period of delay of menstruation the test shows the onset of pregnancy, the instructions will tell him.

The moment of fertilization can conditionally be defined as the day of ovulation. Conditionally, because different changes can occur in the body, both ovulation and fertilization do not occur “on a calendar”. Therefore, it is also impossible to clearly determine the time from which the delay of menstruation counts. It is in connection with this that it is recommended to be patient, wait a couple, or better three days from the start of the expected delay, and then proceed to the test. The sooner a curious woman conducts it, the more likely it is to get an erroneous result.

Inkjet tests with a sensitivity of 10 mU / ml hCG can be tried in the first week of pregnancy, even before the onset of the delay. But the most effective for obtaining an accurate result even as much as five to six days before the expected next month are innovative digital tests. It was experimentally established that about 65% of the correct results using these tests can be obtained four to five days before the expected menstruation.

Innovative digital tests are considered the most effective for obtaining an accurate result even five to six days before the expected next month.

Advice!If the woman’s menstrual cycle is irregular, then in any case, it does not make sense to test before the delay, since the task of determining even the approximate moment of ovulation, fertilization and the next expected periods is complicated. Every woman knows the range of the number of days within which her cycle often fluctuates. After the maximum period, you can begin to act.

Can tests fool?

The instructions for the tests indicate, and doctors also confirm that the result they give, with the correct procedure, has an accuracy of up to 99 percent. But still there remains 1 percent, the category of which, one way or another, is still destined for someone to fall. Why can the test be wrong?

Two types of false responses of a pregnancy test are distinguished: false positive and false negative. Consider the reasons for each of them.

The instructions for the tests indicate that the result they give, with the correct procedure, has an accuracy of 99 percent

An erroneous negative result is most often associated with a number of circumstances:

  • the test has deteriorated, its validity period has expired, or it was produced poorly initially,
  • the test procedure was not performed in accordance with the rules and instructions for the test,
  • a woman has an ectopic pregnancy or the fetus has stopped,
  • the woman who conducted the test took diuretics, which led to the release of unconcentrated urine,
  • there is a risk of a potential early miscarriage,
  • the test was done before the delay, and the level of “pregnancy hormone” in the blood was still normal for non-pregnant women,
  • The hCG hormone is secreted in the wrong amount in the female body due to problems with the kidneys or the cardiovascular system.

Erroneous positive results can also occur, and they are associated with such cases:

  • the use of a damaged, expired test, without reading and following the instructions,
  • the test was carried out in the process of taking certain hormonal drugs that are capable of showing pregnancy,
  • the test was done before the delay, and hCG sought in the body of a woman to the upper threshold of the norm for non-pregnant,
  • the test was performed during the first month after an interrupted (natural or artificial) pregnancy, when the hCG hormone is still present in residual doses.
For test strips and tablet tests, it is mandatory to use a portion of morning urine, in which hCG is present in the highest concentration

Advice!If there are doubts about the correctness of the result, doctors recommend a second test and, depending on his answer, consult a gynecologist. Since in the presence of pathologies that caused an erroneous result, the health and life of a woman can be in danger.

How to get the right answer?

In order for the test to give the most “honest” answer to the question of the innermost, and the woman does not have unnecessary groundless illusions or prematurely falls into despair, everything possible must be done to achieve the most accurate results. Obviously, both objective and subjective circumstances influence the testimony. If a woman cannot influence objective situations in any way (for example, diseases that have not yet been diagnosed, a frozen fetus, etc.), then she can completely exclude the subjective factor.

What are the recommendations given by doctors regarding home pregnancy testing?

  • Do it at the time that is recommended in the instructions. After all, it comes from the sensitivity of the device.
  • For test strips and tablet tests, it is mandatory to use a portion of morning urine, in which hCG is present in the highest concentration.
  • Refrain from going to the toilet three hours before the study.
  • Do not take diuretic drugs and do not drink plenty of fluids during the day before the procedure, so that urine is concentrated.
  • Wait at least five minutes to draw conclusions about the final result. But not more than this period of time.
  • Use only fresh urine, not collected previously (for example, the night before).
The test shows a reliable result five minutes after the procedure with him

Advice!If you find that you have violated any of the rules or requirements of the instruction during the procedure, do not try to fix it all by repeating your actions on the used test right there. It is already unusable and should only be disposed of.

So, at what period of pregnancy, the pharmacy test will definitely show the correct result, depends on many factors. Among them - both the features of the work of each individually taken female body, and the type and sensitivity of the test itself. Digital and inkjet devices can “tell the truth” even before the delay. But most women prefer the traditional unpretentious test strips, which are able to “make their own verdict” only from the beginning of the delay. Therefore, you need to be patient, wait for the onset of menstruation for two or three days from the expected date, and then act.

Which test to choose

The main criterion to determine how long a pregnancy test shows is sensitivity to the "pregnancy hormone". This indicator is always indicated on the package, this number ranges from 10 to 25 honey / ml. The smaller the number, the higher the efficiency of the device.

  1. Electronic (digital) tests. They are considered the most sensitive. They can be used from the first day of the expected period. However, it is possible to determine pregnancy 4-5 days before the expected delay in menstruation, but in this case the correct result is not guaranteed.
  2. Inkjet tests. Also quite sensitive, differ from electronic only in the display of stripes.
  3. Tablet tests. Pregnancy is detected for a period not earlier than 3-4 days of delay, their difference from others also lies in the method of use - only a drop of urine is enough for testing.
  4. Test strip. The reaction to hCG occurs when its concentration is at least 25 ppm / ml. Their sensitivity is less than the other options, but when conducting a study for 5-7 days, menstruation is the same as the rest will show the presence or absence of pregnancy.

In general, the choice of test depends on the woman’s desire to determine conception as early as possible and the method of application convenient for her.

If there is no particular need for early diagnosis of pregnancy, a cheap test strip is as effective as the other varieties, only at a later date.

How to conduct a test

The test may give incorrect results if some simple rules are not followed:

  1. Be sure to read the instructions. The testing method and other nuances may be different.
  2. It is advisable to perform the study early in the morning and use only fresh first urine for this, since it is more concentrated.
  3. Before the procedure, it is not recommended to drink plenty of fluids or consume diuretic drugs and products. In this case, urine becomes diluted and may not be indicative.
  4. The timing should correspond to the selected type of test, depending on its sensitivity.
  5. When buying a dough, you need to check its expiration date and date of manufacture. An expired or defective device may show incorrect results.
  6. Dough packaging must be airtight and not opened.
  7. Do not allow the device to get wet either before or after the procedure.
  8. You cannot reuse the test. After contact of the reagent with urine, it loses its properties.

Whether a pregnancy test in the early stages will show a positive result, it is impossible to say for sure. But if two strips appeared, most likely there is no mistake. And with a negative result, it is better to test again after a couple of days.

HCG blood test

With the general variety of different “home” pregnancy tests, the most accurate diagnosis can be made by passing laboratory blood for analysis. This can be done already after 8-10 days, counting from the date of ovulation or possible conception.

Such a study will not only determine if there is a pregnancy or not, but also accurately show the content of hCG in the blood. Due to this, according to a special table, you can accurately determine the gestational age.

The only inconvenience is that you need to go to a clinic or private laboratory. But if the desire to find out about the presence of pregnancy before the delay is great, then this is the best option.


Determination of the required timing of the test depends entirely on the choice of the device that the woman is testing. If the result is negative in the early stages, it is advisable to repeat the procedure.

On average, 5-7 days after the onset of the delay, 99% of pregnancy tests show a reliable result. Even the usual test strip at this time, with proper use, will determine the presence of pregnancy.

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