How are pregnancy tests
Pregnancy tests are not only price, but also the characteristics of their application. Their task is to detect in a woman's urine specific hormone - human chorionic gonadotropin (hCG), which is produced by the placenta predecessor - the trophoblast cells.
The most common version of a home test - the test strip. Apply can be the first day of menstruation. The disadvantage is that the reagent composition of them susceptible to the highest concentration of hCG in urine. Therefore, they are recommended to do in the morning. And as the morning, all different, that's why in the early stages of pregnancy is high probability of error. The validity of this test in the early days of the delay is about 80-90%. Tablet tests virtually indistinguishable from the test strip. The difference is that when using such a test must collect urine through a disposable pipette and the attached drip into a special small window. The most accurate home pregnancy test are jet. They contain a different reagent, whereby the accuracy of such tests is increased to 99.8%. In addition, their use is already permitted for 3-4 days prior to the onset of menstruation. Another advantage of this method - is the freedom of spending time, that is, not necessarily to do the test in the morning. use principle: the tip of the test must be for a few seconds to substitute under a stream of urine. And yet, when using a test you must follow some basic rules: - test only buy in a pharmacy; - Before purchase is required to check its validity; - To strictly follow the enclosed instructions. Remember that the smaller the menstruation period, the higher the probability of test failure. In case of doubt, in a result, you can repeat the test a few days or to give blood for the hormone hCG. Home pregnancy tests can show the presence of hCG in a woman's body, but do not serve as evidence of the normal uterine pregnancy. Therefore, if the test shows a positive result, you should always consult a doctor to rule out an ectopic pregnancy.