What is a false-negative pregnancy test?

Women in the period of planning the baby repeatedly turn to the tests for the determination of pregnancy. Although the claimed accuracy of almost all tests exceeds 97%, there are still situations when the result is false.

Then a woman is either happy with a non-existent pregnancy, seeing a deceptive second strip, or in vain is upset, not suspecting that she is already in position.

False-negative pregnancy test

This variant of development of events occurs quite often. Consider the causes of a false-negative test. This happens most often because of the impatience and great desire of a woman to know "whether a miracle happened."At the same time, women begin to do tests in batches, without waiting for the delay and each time in vain upsetting. Pregnancy is, and the sensitivity of tests does not allow her to diagnose. In this case, you need to wait for treasured X day so that enough concentration of hCG - human chorionic gonadotropin - pregnancy hormone accumulates in the urine, and repeat the test after several days of delay of the monthly.

1. Another reason why a false-negative test can be obtained is not compliance with the testing rules. Many women do not stand up until the morning and do the test during the day or evening. In this case, the urine will be diluted with the liquid. As a consequence, the concentration of hCG is reduced, which leads to the impossibility of its determination.
2. Violation of any item of instruction will undoubtedly increase the probability of a pregnancy test error. The manufacturer's recommendations should be carefully examined before proceeding with the testing.
3. Sometimes the error may be caused by improper quality of the test system. Expiration of the expiration date, violation of storage conditions or damage to the test is a reason for re-testing the test result.
4. A falsely negative result often occurs when a pregnant woman is at risk of miscarriage or has some kind of pathology. The causes may be an abnormal place of introduction of the fetal egg( ectopic) or abnormal development of the embryo( anembrion or frozen).At the same time, the intensity of the production of human chorionic gonadotropin is reduced, which leads to the impossibility of determining the conception by a domestic method.
5. In some women, when a pregnancy occurs, the test shows a negative result due to improper functioning of the kidneys, which are unable to produce a complete synthesis of substances. The hCG hormone in the urine of such women in the desired concentration appears much later, when the delay can reach a weekly value.

For women who once performed a test and received a negative result, it is necessary to repeat the test at the onset of a delay or seek medical advice from a gynecologist.

False positive result of

Often, women, eager to become mothers, misinterpret the results of pregnancy tests. Slurred strips that are distinguishable under special lighting and only at a certain angle and disappearing as the dough dries up are often treated as a positive result, although they are just a reagent, that is, a dye that must react with urine and give off a bright strip in the event of pregnancy.

There are tests in which the stripes appear slightly brighter, but with visible defects. They can be unevenly colored, have uneven edges or arise in a non-standard place. All this speaks only of the low quality of the test material and the violation of recommendations for conducting the test. Count on the veracity of the pregnancy test in this case is not worth it.

A false positive result of a pregnancy test is obtained if the woman's urine contains chorionic gonadotropin. This occurs with the progression of tumors formed from the cells of the embryo, which spread in different places of the body. Tumors such as chorioepithelioma with cystic swallow produce production of hCG, giving false positive results of pregnancy tests.

The same effect is caused by abnormal ovarian function and hormonal failures. In any case, if you get a positive result, you need to get a gynecologist's advice in order to confirm whether the pregnancy tests are accurate, giving hope for the baby's early appearance.