When will the pregnancy test show the exact result? Can the test not show pregnancy?

Pregnancy is a pleasant period. In this period of time, a woman carries a baby under her heart, whom she has loved since the first minutes of his life. If the conception occurred not according to plan, then, most likely, the representative of the fair sex does not raise the question of when the pregnancy test will show the exact result. This can not be said for those women who are impatiently waiting for the onset of fertilization. They do not sleep at night and transfer several devices for the diagnosis of pregnancy per day. Let's try to understand why there are different results of the pregnancy test. And when to conduct research to obtain the most accurate result and answer the main question: is there a pregnancy?

Principle of conception

On average, once a month, a woman leaves the cage from the ovary. If sexual intercourse occurs during this period, the egg and sperm will merge. From this moment it can be considered that conception took place. During this period, the test for pregnancy will result in a negative result of 100%.

A few days later the fertilized cage, continuing to divide, descends into the genital organ and securely fastens to its wall. From this day, you can already talk about the pregnancy.

Principle of strips

Perhaps the fetal egg is already in the uterus and produces a pregnancy hormone, but the pharmacy test still shows a negative result. Why is this happening?

Everything is very simple. There are two lines on the test strip for home use. They are not visible when testing is not yet conducted and the system is dry. As soon as the reaction with the material collected for testing takes place, a control strip of bright color appears. It can be red, green or blue. It all depends on the manufacturer's preference. The line says that the manipulation was carried out correctly. If there is a pregnancy hormone in the urine of a woman in the required quantity, then the second line will appear - the test line. It can be very bright if the hCG level is high. Also, the line is pale in the case when there is a small amount of substance produced in pregnancy in pregnancy.

Pregnancy hormone production

The exact result of the pregnancy test can be obtained when the concentration of the substance produced by the fetal egg reaches the required level.

Already from the first hours after fertilization, human chorionic gonadotropin is excreted. First, this substance enters the bloodstream and only then forms in the urine. Every day the level of the hormone increases and reaches its maximum in the second trimester of pregnancy.

When will the pregnancy test show the exact result?

Many women are interested in this issue. For sure, every lady conducted a study at home before the delay in menstruation in the hope of obtaining a reliable result. We will make an elementary calculation and try to find out when the pregnancy test will show the exact result.

For example, a woman has a standard cycle, the length of which is 28 days. In this case, the cell exit from the follicle will take place on average on day 14. Since after fertilization, dividing cells need several days to get into the reproductive organ, implantation will occur 3-5 days after the fusion of the chromosomes. There are times when this process takes up to 10 days, but usually it happens faster. So, if the rupture of the follicle was on day 14, then the attachment of the fetal egg will come on 17-19th. Let's take as an example the minimum time. If the chorionic gonadotropin was started on the 17th day of the female cycle, then doubling daily, its amount would be 32 mIU / ml on the 21-23 day of the cycle.

Most strip strips for home use have a sensitivity of 20 to 30 mIU / ml. Once the level of the chorionic gonadotropin reaches this volume, a woman will be able to see a positive pregnancy test.

Wrong result

In some cases, home testing methods can give false results. Why is this happening?

Positive and no pregnancy

Two strips on the apparatus for testing can be seen if it is of poor quality. Quite often, manufacturers of cheap tests use expired or incompatible reagents. The use of such a strip can show a positive result when pregnancy is absent.

Also a false positive result occurs in women with hormonal failure. To produce human chorionic gonadotropin can different tumors of the adrenal and female genital organs.

Negative result: can the test not show pregnancy?

Similarly, as with a false positive result, cheap tests with substandard reagents can produce the wrong result. In this case, the woman thinks that conception did not happen while her new life is already developing and progressing in her body.

Also, the device for diagnosing pregnancy can show a negative result in the case when the level of the necessary hormone has not yet reached its level. That is why most manufacturers of tests recommend to conduct a study only after the delay in menstruation. After all, during this period, the woman's urine already has a sufficient level of substance for establishing the conception.

The result of an ectopic pregnancy test may also be false. When a fetal egg for one reason or another is fixed in the abdominal cavity, on the ovary or in the fallopian tube, the secretion of the pregnancy hormone is slower. It increases not twice in every day, but approximately 0.5 times every two to three days. That is why even after a delay, the test result with an ectopic pregnancy may remain negative.

One can not ignore the fact that in the urine the level of chorionic gonadotropin is much lower than in the blood of a pregnant woman.

Which pregnancy test to choose for an accurate result?

It is worth recalling that all devices for the diagnosis of pregnancy are divided into:

• Tablet;
• Inkjet;
• Electronic.

Conventional tablet tests are the most budget option for use. They have a sensitivity of 25-30 mIU / ml. Because of this, the exact result can be obtained only after the delay in menstruation.

Inkjet devices for diagnostics are more expensive, but they are more convenient to use and have high sensitivity. Pregnancy such tests are shown when the amount of the hormone in the urine reaches a level of 10-15 mIU / ml.

Electronic devices are the most expensive, but they are more reliable. For example, the results of the pregnancy test "Clearblue" will be accurate even before the delay. The manufacturer recommends conducting the research already 4 days before the onset of a new cycle.

Conclusion

Now you know when the pregnancy test will show the exact result. Every woman knows her body like no other. It is she who can calculate as precisely as possible the day in which ovulation and conception occurred. Using the example for calculation, which is given above, it is possible to find out which day of the cycle it is better to conduct research in order to obtain the most accurate result.