When there is a need for reliably verify whether a woman is pregnant or not, there is always the possibility of error when using urinary tests. Lie if pregnancy tests - one of the most frequently asked questions gynecologist when a woman comes for consultation. To obtain reliable, most accurate results, you must strictly comply with certain conditions.

In some cases, there are mistakes

A more correct to say it was not an error of test systems and on obtaining false-positive or false-negative results. There are a number of conditions that the woman should be observed before proceeding to the study:

• acquire a diagnostic test system is recommended in pharmacies. There is first of all necessary conditions are met storage. If the test is stored in the refrigerator, it becomes unusable.
• to study the urine of the morning to be, then it will be concentrated and undiluted. Permissible to perform the test in the afternoon, then it should be done after three to four hours urinary retention and to try in this period to drink plenty of fluids. Urine for research should not be diluted.
• diagnostic importance is how long a woman does test. It can not overdo or do too quickly, the optimal time - five minutes.

What matters is the fact whether the woman takes any drugs. Some medications can lead to false-positive results, for example, is the preparation of human gonadotropin, or hCG. They have a feature to accumulate in the body, so that the result of the test may indicate the presence of pregnancy in its absence. Several hormones (synthetic progestogens) distort the results, so be sure to consider, whether or not a woman gets the medicines. This will help avoid the negative emotions associated with the fact that urinary tests lie and they can not be trusted.

How to choose the right test

The outcome of the urinary test influences its sensitivity, which is defined in units corresponding to the content of human chorionic gonadotropin in the blood of women. Tests may have a sensitivity of 20 to 100 mIU / ml. If you buy a test with sensitivity indices that do not correspond to the concentration of hCG at the time in a woman's body, the test result may be negative. For example, if at the time of the test concentration of the hormone in the blood was 35 mIU / ml, and the test has a sensitivity higher than that of, the test will show a false-negative result. Pregnancy during this period will not be revealed, although it is, but also on the short term. In this situation, a woman may find that urinary test was wrong, that is, he's lying. If a pregnancy test Pregnancy tests - early diagnosis   It was negative, but the woman does not come the next menstrual period, it is necessary to repeat the test a week after the first test. It is not necessary to repeat the test, if the second strip on the test showed weakly positive, clearly marked. This suggests the presence of pregnancy if the woman has spent the test correctly, with all the necessary conditions.

Currently, there are more sophisticated tests that give an almost perfect result. This tests that belong to the category of third generation or jet. If such a test is done correctly, there is no doubt in the reliability of the results. It is based on the principle of interaction of special particles (antibody) molecules of the hormone gonadotropin. The reaction of the formation of antigen-antibody complex that formed the basis of establishing pregnancy test based on the inkjet system. This principle makes it possible to achieve high reliability of the test. The only significant disadvantage is the cost. In a situation when a woman doubts the reliability of the test, it makes sense to purchase a high quality urine test.

Marina Solovyov

Related Articles

Pregnancy tests - early diagnosis

Weakly positive pregnancy test: can the error

Do mistaken pregnancy tests - what is the likelihood of errors

The test for sterility when it is not necessary to hesitate?