To determine the pregnancy in early terms at home, usually many women use a test that can be purchased on any pharmacy, and mostly such tests are rarely lied. Want to know how often pregnancy tests lie?

How to find out if pregnancy tests lie?

Early pregnancy diagnosis helps to avoid many problems in the future while tooling a healthy child. The first signal is that you are pregnant - this is, of course, the absence of a menstrual cycle. Also, elevated appetite, excessive drowsiness, nausea, vomiting, dizziness can also become symptoms of pregnancy. However, sometimes the woman of these symptoms is not enough to establish pregnancy or they are not fully manifested and then it decides to take advantage of the test to determine pregnancy.

In which case the pregnancy test is lying?

It costs to remember that the domestic test is sometimes lying and can not always show the correct result. Both false positive and false negative results are possible if there are following conditions:

  • Kidney disease;
  • Reception of hormonal drugs that contain hong hong;
  • Consumption of a large amount of fluid that flushes a hormone from urine;
  • Ovarian cyst, gynecological tumors;
  • Risk of miscarriage;
  • Ectopic pregnancy;
  • Dough sensitivity level. To identify pregnancy, a test with a sensitivity of 10 MME / ML is recommended for 7 days;
  • The implantation of a fertilized egg in the uterus can occur on 10 day after fertilization, so the concentration of hCG is insufficient to determine pregnancy;
  • Violated the shelf life and storage of pregnancy test;
  • Packaging of pregnancy test was broken, moisture got inside;
  • Failure to follow instructions for the use of pregnancy test.

For a reliable result, it is necessary to refer to the gynecologist, which will appoint a test for the determination of the level of hormone in the blood of a woman. Such a test is not lying, as it is carried out in clinical conditions and helps to determine the dynamics of hormone growth, show ectopic pregnancy, prevent miscarriage or fetal fetal.

Can you do a pregnancy test during menstruation?

Undoubtedly, if a woman notices all the symptoms of pregnancy. Usually, the ovulation of many women and girls occurs on the 13-14 day of the menstrual cycle. When fertilization occurs in this cycle, the egg reaches the uterus only on 7-15 days. If implantation occurred later than usual, then menstruation can begin. There are cases when two eggs in different ovaries ripen for one cycle, and if one fertilizes, then the other comes out with the endometrium, forming menstruation. A positive pregnancy test for menstruation is possible and in the presence of a hormonal disorder, ectopic pregnancy or threat of miscarriage. In any case, even if the woman does not believe that the pregnancy test is lying, it is worth consulting a doctor.

How does the test determines the pregnancy?

Pregnancy test is a HCG hormone indicator (human chorionic gonadotropin). Such a hormone highlights a fruit egg after the fertilized egg took place through the phallopis pipes and implanted into the uterine cavity. This is usually happening on the 6th day of pregnancy, while the hormone in the urine increases every two or three days, and decreases only by the tenth of the week of pregnancy.

What do strips mean a pregnancy test?

Pregnancy test contains a special indicator that is able to bind hCG, while changing its color if the hormone concentration exceeds the indicator sensitivity threshold. The first test strip indicates that it is suitable for use, and the second one notifies the presence or absence of pregnancy. Even weak coloring of the second strip indicates pregnancy, since the presence of a hormone varies with time in the body of a woman. Under all the rules for using the test, it has a 98% guarantee.

Pregnancy test will help identify the interesting position of a woman in early terms and signal changes in its body. But only a gynecologist in the hospital will be able to put the most accurate diagnosis, so after the detection of the cherished two strips should not be tightened with a visit to the doctor.

If all your knowledge of pregnancy tests are limited to the bikes about "two stripes", then this article is what you need for you ..

What is a pregnancy test and how it works

Pregnancy tests are aimed at detecting blood or urine substance, which is called human chorionic gonadotropin (HCG). This hormone begins to produce at the very moment when the fertilized egg is attached to the wall of the uterus.

Usually - although not always - this happens six days after conception. In the event of pregnancy, the level of hCG begins to grow extremely rapidly, doubles every two or three days.

What are the tests for pregnancy

In general, they can be divided into two groups: blood tests and urine.

You can conduct urine analysis not only in the conditions of the medical office, but also at home. These express tests are simple and convenient. To achieve the most accurate results, carefully follow all the rules described in the instructions.

Blood analysis is carried out only in medical and preventive institutions. This method allows you to identify pregnancy in very early time, but for understandable reasons results you need to wait longer than when analyzing urine.

Blood tests on hCG are two types:

1) A qualitative test - states the fact of the presence or absence of HCG in the blood. In fact, gives only an answer to the question "Are you pregnant?".

2) Quantitative test (beta-hCG) measures the exact amount of blood hormone. The sensitivity of this test is extremely high. Knowing the exact concentration of this hormone makes it possible to track problems arising during pregnancy. In addition, this test is absolutely necessary for the diagnosis of ectopic (pipe) pregnancy.

How accurate pregnancy tests

To accurately determine pregnancy, you must wait at least ten days after the delay. It is advisable to test the test in the morning when urine is maximally concentrated.

The accuracy of home express test tests is approximately 97%. The following factors can affect this indicator:

1) carefulness of compliance with all instructions.

2) the timing of ovulation and implantation of the egg in the wall of the uterus.

3) Suitable selection of dough.

4) Sensitivity of a specific test.

The price of test and difficulty when using

You can buy a pregnancy test in any pharmacy without a recipe. The price depends on the manufacturer. For the most part, they are inexpensive: price range varies from 80 to 800 rubles, rarely more expensive.

Operation of home tests usually does not cause difficulties. The most convenient tests that can be kept right under the streams of urine, but there are other options: some stripes are prescribed to lay in a glass with urine, you need to drip with a pipette.

Be that as it may, after contacting urine, you need to wait a few minutes to get the result. The latter can manifest in the form of a strip, color change or with the help of symbols (for example, "+" or "-"). For sale and advanced digital tests that will give you the word "pregnant" on the display.

How to interpret the test results

It is important to know what the positive and negative results of the pregnancy test are meaning.

If the result positiveSo you are pregnant. And no matter how little faded strip, symbol or sign. In rare cases there are so-called conditional positive results: when, according to the test results, pregnancy came, which is actually not true. Such errors can be associated with the presence of protein or blood in the urine, as well as using some drugs (tranquilizers, anti-convulsants and others).

Negative The result means that most likely you are not pregnant. However, it is possible to reverse, if:

1) expired the shelf life of the test strip,

2) you violated the rules of operation,

3) You spent a test on too early,

4) You have too diluted urine due to the fact that you drank a lot of water on the eve,

5) You accept some drugs (for example, diuretics and antihistamines).

If you received a negative result, just in case, repeat the test after a week for the guarantee.

If after several tests you received unequal results, consult a doctor. Perhaps it's time to test blood for hCG.

Modern pharmaceuticals provides a woman with the help of testing devices to find out, it is pregnant or not. Gynecologists call it a simple study by one of the most reliable ways to determine at home, whether the child is waiting for a child. But for some reason it happens that the test gives a false result. What makes mistakes occur?

How is a pregnancy test

When in the body of a woman after fertilization of the egg, an embryo implantation occlare, in its blood and, accordingly, in the urine, a certain hormone appears - chorionic human gonadotropin (HCG). To identify it on a piece of paper, an industrial method is caused by a small strip of specific immunoglobulins - sorbed antigens labeled with colloid gold. When contacting antigens with urine, a reaction occurs. If the hormone is present in the liquid, then visually it is manifested in the form of a red thread. If the HCG is not, or its number is negligible, only one control strip is noticeable on the test, testifying that the system works. But if the test is so simple and clearly arranged, why will it sometimes fail?

Simple mistakes

The causes of erroneous testimony of pregnancy test may be different. For example, the expiration of the shelf life of the product itself, the temperature of the temperature regime during its storage or transportation, as well as incorrect use. According to the instructions, the daily or better morning urine is required to obtain accurate data, the chorionic human gonadotropin is concentrated in it.

The incorrect reaction of the test device may take place with an insufficient level of the hormone in the event that the egg cell is fertilized, but the embryo has not yet attached to the wall of the uterus. Usually this process occurs after the seventh day of conception, and only then the HCG, created by nature for the normal development of the placenta, begins to stand out. However, it happens on the contrary: the test shows the presence of pregnancy, and during the gynecological inspection it is not detected.

Causes of false positive test results

The method of detecting hCG with a reaction to specific immunoglobulins is used in medicine in the laboratory diagnosis of many infectious diseases and hormonal disorders. In particular, such pathology, like chorionepitheloma, can also be confirmed by a positive pregnancy test, although this disease belongs to oncology.

Chorionic gonadotropin for some time present in the body of a woman after a recent abortion or miscarriage. This hormone is also part of some drugs for infertility treatments, and for this reason, the test can also show a positive result, although there is virtually no pregnancy.

If the study unambiguously reveals the presence of hCG, and in the gynecological inspection, an increase in the uterus is not fixed, then this is a clear sign of ectopic pregnancy. Therefore, the fertilized egg was implanted in a phallopyan pipe and an emergency operational intervention is required. So it happens, the test at home saves health and even the life of a woman.

False negative results

Cases when there is no red stripes on the dough, and the pregnancy is developing in the meantime, extremely rare. This is usually associated with the problem of the urinary system. For example, chronic kidney diseases often lead to gross violations of the excretory function. Then the concentration of hCG in the urine is seriously reduced, even if the blood hormone level is increased.

The large consumption of liquid or diuretic drugs before conducting the study, too, most likely will change the result in the negative side, since chorionic gonadotropin will be rapidly washed.

In atypical diseases, such as anorexia, there is often a reduction in the development of various genital hormones. At the same time, a woman may have a pregnancy, but the level of hCG in the urine in the first three or four weeks is usually insufficient to confirm this using a standard test. And in this case, whether the woman is waiting for a child, you can only find out in the gynecologist.

It should also be remembered that alcohol, fatigue, stress, lactation, the reception of any non-immortal drugs, as well as contraceptive tablets on the test results, do not affect the test.

Modern pharmaceuticals provides a woman with the help of testing devices to find out, it is pregnant or not. Gynecologists call it a simple study by one of the most reliable ways to determine at home, whether the child is waiting for a child. But for some reason it happens that the test gives a false result. What makes mistakes occur?

How is a pregnancy test

When in the body of a woman after fertilization of the egg, an embryo implantation occlare, in its blood and, accordingly, in the urine, a certain hormone appears - chorionic human gonadotropin (HCG). To identify it on a piece of paper, an industrial method is caused by a small strip of specific immunoglobulins - sorbed antigens labeled with colloid gold. When contacting antigens with urine, a reaction occurs. If the hormone is present in the liquid, then visually it is manifested in the form of a red thread. If the HCG is not, or its number is negligible, only one control strip is noticeable on the test, testifying that the system works. But if the test is so simple and clearly arranged, why will it sometimes fail?

Simple mistakes

The causes of erroneous testimony of pregnancy test may be different. For example, the expiration of the shelf life of the product itself, the temperature of the temperature regime during its storage or transportation, as well as incorrect use. According to the instructions, the daily or better morning urine is required to obtain accurate data, the chorionic human gonadotropin is concentrated in it.

The incorrect reaction of the test device may take place with an insufficient level of the hormone in the event that the egg cell is fertilized, but the embryo has not yet attached to the wall of the uterus. Usually this process occurs after the seventh day of conception, and only then the HCG, created by nature for the normal development of the placenta, begins to stand out. However, it happens on the contrary: the test shows the presence of pregnancy, and during the gynecological inspection it is not detected.

Causes of false positive test results

The method of detecting hCG with a reaction to specific immunoglobulins is used in medicine in the laboratory diagnosis of many infectious diseases and hormonal disorders. In particular, such pathology, like chorionepitheloma, can also be confirmed by a positive pregnancy test, although this disease belongs to oncology.

Chorionic gonadotropin for some time present in the body of a woman after a recent abortion or miscarriage. This hormone is also part of some drugs for infertility treatments, and for this reason, the test can also show a positive result, although there is virtually no pregnancy.

If the study unambiguously reveals the presence of hCG, and in the gynecological inspection, an increase in the uterus is not fixed, then this is a clear sign of ectopic pregnancy. Therefore, the fertilized egg was implanted in a phallopyan pipe and an emergency operational intervention is required. So it happens, the test at home saves health and even the life of a woman.

False negative results

Cases when there is no red stripes on the dough, and the pregnancy is developing in the meantime, extremely rare. This is usually associated with the problem of the urinary system. For example, chronic kidney diseases often lead to gross violations of the excretory function. Then the concentration of hCG in the urine is seriously reduced, even if the blood hormone level is increased.

The large consumption of liquid or diuretic drugs before conducting the study, too, most likely will change the result in the negative side, since chorionic gonadotropin will be rapidly washed.

In atypical diseases, such as anorexia, there is often a reduction in the development of various genital hormones. At the same time, a woman may have a pregnancy, but the level of hCG in the urine in the first three or four weeks is usually insufficient to confirm this using a standard test. And in this case, whether the woman is waiting for a child, you can only find out in the gynecologist.

It should also be remembered that alcohol, fatigue, stress, lactation, the reception of any non-immortal drugs, as well as contraceptive tablets on the test results, do not affect the test.

From the moment the egg is attached to the uterus, the woman's body receives information and begins preparations for it. The work of many organs under the influence of hormones, which begin to be produced more actively. The level of chorionic gonadotropin of man, or HCG - hormone, according to which pregnancy is determined. Tests are based on an assessment of the number of this substance in the urine of a woman - if its level exceeds the norm for a non-remote woman, then the test shows a positive result, which says that with the most likely lady is waiting for a child.

Pregnancy tests are convenient because they can be conducted in, no special equipment required for this. They are reliable compared to other home methods of definition. Tests from different manufacturers have different sensitivity: when one cannot yet because of the early term and small amount of hormone, others already show distinct red stripes.

Most tests guarantee an almost accurate result from the first day of delay, but it is necessary to understand that the hormone accumulates gradually, and in the urine its concentration is much lower than in the blood, therefore, the longer the time passes from the moment of conception, the more accurate will be the result. Doctors advise to accuracy test ten days after the delay.

A pregnancy test should be done in the morning when the concentration of various substances is increased in the urine.

When is the false result of pregnancy test?

Buying a test, check out its shelf life - if it has expired, it is impossible to hope for an accurate result. The test can lie if you do not according to the instructions. Carefully read all the instructions on the package and follow them carefully. For accuracy, use two or three tests of different firms.

Pregnancy tests can show false-positive and falsely negative results, and the second cases are much more often. A negative result during pregnancy is an indication that in the urine there is still an insufficient HCG level so that the test can determine it. This happens if the conception occurred a few days before the presumptive period of starting menstruation.

If you have a lot of water before the test, the hormone concentration in the urine drops, and the test can also show a negative result.

A positive result in the absence of pregnancy occurs very rarely and is associated either with poor-quality products, or with health problems, when taking some drugs that cause an elevated level of hCG in the body. It can also be a sign of ectopic pregnancy and threat of miscarriage.