Pregnancy is a pleasant period.During this period of time, a woman wears an infant under her heart, whom she already loves from the first minutes of his life. If conception did not occur according to the plan, then, most likely, 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 eagerly awaiting the onset of fertilization. They do not sleep at night and translate several devices for the diagnosis of pregnancy per day. Let's try to understand why there are different results of a 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, a woman comes out once a monthcell from the ovary. If sexual contact occurs during this period, then the egg and spermatozoon will merge. From this point on, we can assume that the conception took place. During this period, a pregnancy test result of 100% will be 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 you can already talk about the pregnancy took place.
Strip stripes principle of operation
Perhaps the gestational egg is already in the uterus and produces a pregnancy hormone, but the pharmacy test still shows a negative result. Why it happens?
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 research, a control strip of bright color appears. It can be red, green or blue. It all depends on the preference of the manufacturer. The line says that the manipulation was carried out correctly. If the pregnancy hormone is present in the woman's urine in the required amount, then the second line will also appear - the test line. It can be very bright if the hCG level is high. Also, the line is pale in the case when in the urine there is a small amount of a substance produced during pregnancy.
Development of pregnancy hormone
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 fertilizationhuman chorionic gonadotropin is released. First, this substance enters the bloodstream and only after that is formed in the urine. Every day the hormone level increases and reaches its maximum by the second trimester of pregnancy.
When does a pregnancy test show an accurate result?
Many women are interested in this issue.Surely, each lady conducted a study at home even before the delay of menstruation in the hope of obtaining a reliable result. We 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, lengthwhich is 28 days. In this case, the output of the cell from the follicle will occur on average on day 14. Since after fertilization, the dividing cells need several days to get into the reproductive organ, implantation will occur 3-5 days after the chromosome fusion. There are cases when this process takes up to 10 days, but usually it happens faster. So, if the rupture of the follicle was on the 14th day, then the attachment of the ovum will come on the 17th-19th. Take as an example the minimum time. 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 for the 21-23 day of the cycle.
Most strip strips for homeuses have a sensitivity of 20 to 30 mIU / ml. As soon as the level of human chorionic gonadotropin reaches this volume, the woman will be able to see a positive pregnancy test.
Wrong result
In some cases, home testing methods may give false results. Why it happens?
Positive result and absence of pregnancy
Two strips on the apparatus for testing cansee if it is substandard. Quite often, cheap test manufacturers use expired or non-standard reagents. The use of such strips can show a positive result when the pregnancy is absent.
Also, a false positive result occurs in women with hormonal failure. Various human adrenal gland and female genital tumors can produce human chorionic gonadotropin.
Negative result: can the test not show pregnancy?
Similarly, as with false positiveas a result, cheap tests with poor quality reagents may give incorrect results. In this case, the woman thinks that conception did not happen at that time, as a new life is already developing and progressing in her body.
Also a device for diagnosing pregnancycan show a negative result in the case when the level of the required hormone has not yet reached its level. That is why most test manufacturers recommend conducting a study only after a delayed menstruation. Indeed, during this period in the urine of a woman there is already a sufficient level of the substance to establish conception.
Test result in ectopic pregnancymay also be false. When the fertilized egg for one reason or another is fixed in the abdominal cavity, on the ovary or in the fallopian tube, the release of the pregnancy hormone 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 for ectopic pregnancy may remain negative.
It is impossible not to take into account the fact that in the urine the level of human chorionic gonadotropin is significantly lower than in the blood of a pregnant woman.
What pregnancy test to choose for an accurate result?
It is worth recalling that all devices for the diagnosis of pregnancy are divided into:
- tablet;
- jet;
- electronic.
Regular tablet tests are the most affordable option to use. They have a sensitivity of 25-30 mIU / ml. Because of this, an accurate result can only be obtained after a delayed menstruation.
Inkjet diagnostic machines are more expensivebut they are more comfortable to use and have high sensitivity. Pregnancy tests are shown when the amount of hormone in the urine reaches a level of 10-15 mIU / ml.
Electronic devices are the mostexpensive, but they are also more reliable. For example, the Clearblue pregnancy test results will be accurate even before the delay. The manufacturer recommends that the study be conducted 4 days before the onset of a new cycle.
Conclusion
Now you know when a pregnancy testwill show the exact result. Every woman knows her body like no other. That she can calculate as accurately as possible the day in which ovulation and conception occurred. Using the example for the calculation given above, you can find out on which day of the cycle it is better to conduct research to obtain the most accurate result.
