Health

Since when does a pregnancy test show a reliable result?

Often, women who dream of becoming moms are so eager to find out if they succeeded in creating their long-awaited miracle that they don’t think about how long the pregnancy test shows the exact result and are taken to carry out the procedure long before the menstrual delay. But the question arises whether they have a chance to get a correct answer from the first time, without waiting for the expected date of the next menstruation. After all, traditionally, the first sign announcing a possible "interesting position" has always been considered its absence.

It is reasonable to conduct a test on the third day of the delay

What does the test respond to?

To understand when it is advisable to carry out a pregnancy test and from what time it shows an exact positive result, it is necessary to know how it works, thanks to which it “formulates its answer”.

The only purpose for which a woman carries out such a test is to obtain an accurate answer to the question of the presence / absence of pregnancy. Identify any pathology or other changes in the body using such tests will not succeed.

Any test, with variants of which every pharmacy is replete with, works due to its “programming” to detect the presence of an elevated blood content of the hormone known to everyone as hCG (its full name sounds “chronic human gonadotropin”). The substance is accepted both by the people and in medical practice to be called the "pregnancy hormone".

Any test works because of its “programming” to detect the presence of an elevated blood hormone known to everyone as hCG (its full name sounds “chronic human gonadotropin”)

In the female body in a state where pregnancy is not observed, the proportion of hCG is estimated to be in the range from 0 to 10 mU / ml. Such a concentration in the blood is preserved during the first week after the spermatozoa managed to fertilize the egg, reaching the upper mark from the specified range. Only the supersensitive test is able to react to the upper threshold (10 IU / ml) of this substance, which saturates the blood.

From the period of ovulation and presumptive fertilization to the final attachment of the embryo to the intrauterine endometrium often takes less than seven to ten days. And from this most cherished moment, the content of hCG in the blood begins to rise. Most modern tests are able to recognize an indicator of 20 IU / ml or even more. And he, in turn, is achieved in the blood not earlier than two weeks after fertilization of the female egg. If you count on the calendar cycle, this time is related to the period when the next menstruation should begin. If she does not come, it’s customary to talk about the delay as the first bell announcing that it’s time to do a pregnancy test.

"Hormone pregnant" tend to be derived from the female body in the composition of urine. Therefore, all home pregnancy tests are based on contact with the female urine to determine the result. Each test strip is treated with a special reagent that makes it sensitive to this hormone.

"Hormone pregnant" tend to be derived from the female body in the composition of urine. Therefore, all home pregnancy tests are based on contact with the female urine to determine the result.

Tip! 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.

What test to use?

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

  • strip strip;
  • tablet;
  • jet;
  • digital.

Strip strips are now considered the most "running" and cheap option for quick determination of pregnancy. Show the result they are ready within five minutes after testing. And it is carried out in this way: a portion of morning urine is collected in a reservoir, in which the test strip is immersed to the marked limit for only a couple of seconds. These tests respond to a pregnancy hormone concentration of no less than 20 IU / ml. And it is often somewhat higher.

A tablet-type test is similar to a box that holds a pair of “windows”. In one of them should drop urine, and in the other as a result of a chemical reaction will be the answer to the cherished question: one or two strips. For convenience, they occupy the highest step, compared with the previous version, and are approximately equal in sensitivity.

A tablet-type test is similar to a box that holds a pair of “windows”. In one of them should drop urine, and in the other as a result of a chemical reaction will appear the answer to the cherished question: one or two strips

Ink jet tests are more sensitive. The instruction to them says that they will "work" even if there is hCG in the body of a lucky woman - the future mother at the level of 10 IU / ml. It is not necessary to wait for the early morning to carry out the procedure. At any time, day or night, placing the device under a stream of urine, you can be sure (or vice versa) in their assumptions about the pregnancy.

Thanks to the progress of science and technology, high-precision digital tests have appeared today that can not only tell as much as possible about the presence of pregnancy, but also use the special indicator to clearly indicate the period for which the expectant mother is. The accuracy of this test is equivalent to ultrasound. But the cost of such a "pleasure" is high.

Tip! Choosing a test, you need to focus not only on the cost and convenience of the procedure, but on the period on which you intend to conduct it, based on the capabilities and accuracy of each type of test.

So when to carry out the procedure?

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

  • "ability" of the acquired test device;
  • day of the menstrual cycle;
  • the well-known dynamics of increasing concentration of "pregnancy hormone" in the blood.

The exact time of the delay of the menstrual test shows that the pregnancy has occurred will be given by the instructions to it.

So, if you stocked up with strip strips, tablet tests that are sensitive to the content of hCG from 20 IU / ml, then earlier than the second day of the delayed menstruation should not be done. The fact is that, as mentioned above, only two weeks after fertilization of the egg the level of the hCG hormone reaches such a threshold that the test can detect it. More precisely, at what specific period of delay of the menstrual test shows the occurrence of pregnancy, will tell the instructions to him.

The moment of fertilization can be conditionally defined as the day of ovulation. Conventionally, because in the body there can be various changes, and ovulation itself, and fertilization do not occur "according to the calendar." Therefore, it is also impossible to clearly define the time from which the delayed menstruation is counting. It is in connection with this that it is recommended to be patient, wait for a couple, and preferably three days from the start of the estimated delay, and then proceed to the test. The sooner a curious woman spends it, the greater the likelihood of an erroneous result.

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

Innovative digital tests are considered to be the most effective for obtaining accurate results even five to six days before the expected next months.

Tip! If a woman’s menstrual cycle is irregular, then in any case it is not worthwhile to test before a delay, since the task of determining even the approximate time of ovulation, fertilization and the next expected monthly is more difficult. 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 cheat?

The instructions for the tests indicated, and the doctors also confirm that the result that they give out, if carried out properly, has an accuracy of up to 99 percent. But still there is 1 percent, under the category of which, one way or another, it’s still destined to someone. Why is the test wrong?

There are two types of false answers pregnancy test: false positive and false negative. Consider the reasons for each of them.

The instructions for the tests indicate that the result they give out, if carried out properly, has an accuracy of up to 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 initially produced poorly;
  • the testing procedure was not performed in accordance with the rules and instructions for the test;
  • the woman had an ectopic pregnancy or the fetus froze;
  • the woman who conducted the test took diuretics, which resulted in the release of unconcentrated urine;
  • there is a risk of a potential miscarriage at an early date;
  • the test was done before the delay, and the level of pregnancy hormone in the blood was still normal for non-pregnant women;
  • The hormone hCG is secreted in the wrong quantities in the female body due to kidney problems or the cardiovascular system.

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

  • use of a spoiled, expired test, without reading and following the instructions;
  • the test was carried out in the process of taking certain hormonal drugs that are able to show pregnancy;
  • the test was made even before the delay, and hCG aspired in the woman’s body to the upper threshold of the norm for the non-pregnant;
  • The test was performed during the first month after aborted (natural or artificial) pregnancy, when the hormone hCG is still present in residual doses.

For test strips and tablet tests, you must use a portion of morning urine, in which hCG is present in the highest concentration

Tip! If there are doubts about the correctness of the result, doctors recommend to repeat the test and, depending on his answer, consult a gynecologist for advice. 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 about the innermost, and the woman did not harbor unnecessary baseless illusions or did not despair prematurely, she should do everything possible to achieve the most accurate results. Obviously, both objective and subjective circumstances influence the test readings. If a woman cannot influence objective situations in any way (for example, diseases that have not been diagnosed yet, frozen fetus, etc.), then she can completely and completely exclude the subjective factor.

What recommendations do doctors give regarding home pregnancy testing?

  • To do it in the period recommended in the instructions. After all, it comes from the sensitivity of the device.
  • For test strips and tablet tests, it is imperative to use a portion of morning urine, in which hCG is present in the highest concentration.
  • Keep from going to the toilet for 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 the urine is concentrated.
  • Wait at least five minutes to draw conclusions about the final result. But not more than this length of time.
  • Use only fresh urine, not previously collected (for example, the night before).
The test shows a reliable result five minutes after the procedure with him.

Tip! If you find that you have violated some of the rules or requirements of the instructions during the procedure, you should not try to fix everything by immediately repeating your actions on the test used. 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 are both features of the work of each female body taken separately, and the type and sensitivity of the test itself. Digital and inkjet devices can "tell the truth" even before the delay. But the majority of women prefer traditional unpretentious test strips, which are able to "pass their verdict" only from the beginning of the delay. Therefore, you need to be patient, wait for the onset of menstruation two or three days from the expected date, and then act.