False pregnancy test

In our time, pharmacies may be relatively inexpensive to purchase tests that make it easy at home to diagnose pregnancy. All these tests are based on the identification of specific hormone in the urine – human chorionic gonadotropin (hCG). This hormone is produced by the female body begins during pregnancy, namely, the day after implantation (attachment) a fertilized egg to the uterus, which roughly corresponds to one week after conception. The test detects pregnancy in the first days after the missed period, ie determines pregnancies at least 14 days.

It often happens that when a woman holding a pregnancy test, see the cherished two strips, it does not believe his eyes, begins to doubt the veracity of the test, purchase, just in case some tests of other manufacturers … And does it make sense? Can the test be wrong?

Answer: yes it can. Although the probability of such errors if used properly, is very small: the accuracy of pregnancy tests is 97%.

In some cases, the test can give false positive or false negative result?