Pregnancy is a pleasant period. During this period of time, a woman carries under her heart a baby whom she loves already from the first minutes of his life. If the conception did not happen 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 cannot be said of those women who are impatiently awaiting fertilization. They do not sleep at night and translate several devices for diagnosing pregnancy per day. Let's try to figure out why there are different results of a pregnancy test. And when to conduct a study 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 a cell from the ovary. If sexual contact occurs during this period, then the egg and sperm will merge. From this moment we can assume that the conception has taken place. During this period, a pregnancy test result of 100% will give a negative.
Within a few days, the fertilized cell, continuing to divide, descends into the genital organ and is securely attached to its wall. From this day we can already talk about the pregnancy.
The principle of operation of strip strips
Perhaps the fetal egg is already in the uterus and produces the hormone of pregnancy, 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 has not yet been carried out and the system is dry. As soon as a reaction occurs with the material collected for the study, a bright-colored control strip appears. It can be red, green or blue. It all depends on the preference of the manufacturer. The line indicates that the manipulation was carried out correctly. If the woman’s urine contains the pregnancy hormone in the required amount, 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 a small amount of the substance produced during pregnancy is present in the urine.
Pregnancy hormone production
The exact result of a pregnancy test can be obtained when the concentration of the substance produced by the fetal egg reaches the required level.
From the first hours after fertilization, human chorionic gonadotropin is released. First, this substance enters the bloodstream and only then forms in the urine. Every day, the hormone level rises and reaches its maximum by the second trimester of pregnancy.
When will a pregnancy test show an accurate result?
Many women are interested in this issue. Surely, every lady conducted a study at home before the delay of 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 leaves the follicle 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 chromosomes. There are times when this process takes up to 10 days, but usually it happens faster. So, if the follicle rupture was on the 14th day, then the attachment of the fetal egg will occur on the 17-19th. Take the minimum time frame as an example. If chorionic gonadotropin began to be produced on the 17th day of the female cycle, then doubling daily, its amount will be 32 mIU / ml on the 21-23th day of the cycle.
Most strip strips for home use have a sensitivity of 20 to 30 mIU / ml. Once the level of 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 result and lack of pregnancy
Two strips on the testing apparatus can be seen if it is of poor quality. Quite often, manufacturers of cheap tests use expired or non-standard 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. Various tumors of the adrenal glands and female genital organs can produce human chorionic gonadotropin .
Negative result: can the test not show pregnancy?
Similarly, as with a false-positive result, cheap tests with poor-quality reagents can give the wrong result. In this case, the woman thinks that conception did not happen while a new life is already developing and progressing in her body.
Also, an apparatus for diagnosing pregnancy can show a negative result when the level of the necessary hormone has not yet reached its level. That is why most manufacturers of tests recommend conducting a study only after a delay in menstruation. After all, during this period, a woman already has a sufficient level of substance in her urine to establish conception.
The test result for an ectopic pregnancy 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 release of the hormone of pregnancy is slower. It does not increase twice every day, but about 0.5 times every two to three days. That is why, even after a delay, the test result with an ectopic pregnancy can remain negative.
We can not ignore the fact that in urine the level of chorionic gonadotropin is much lower than in the blood of a pregnant woman.
Which pregnancy test to choose to get the exact result?
It is worth recalling that all devices for diagnosing pregnancy are divided into:
- tablet;
- inkjet;
- electronic.
Conventional tablet tests are the most budget option to use. They have a sensitivity of 25-30 mIU / ml. Because of this, an accurate result can be obtained only after a delay in menstruation.
Diagnostic inkjet devices are more expensive, but they are more convenient to use and have high sensitivity. Such tests show pregnancy 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 also more reliable. For example, the results of the Clearblue pregnancy test will be accurate even before the delay. The manufacturer recommends conducting the study 4 days before the start 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 accurately as possible the day on which ovulation and conception occurred. Using the calculation example given above, you can find out on which day of the cycle it is better to conduct research to obtain the most accurate result.