Individual tests for the establishment of pregnancy are very comfortable and elementary in application. They give a chance to quickly and efficiently determine the presence of fertilization and the expediency of visiting an obstetrician-gynecologist.
How is the pregnancy test done?
There is a wide range of devices for this purpose, which may differ in shape, design or price. One of the tests involves collecting urine in a vessel and immersing a paper strip in it to the level indicated on it. Others just need to hold under the stream of urine for a few seconds. It is not necessary to carry out a pregnancy test in the evening, the optimal substance is considered to be morning urine. Depending on the above parameters, the result can be obtained within 30 seconds or several minutes.
How many stripes on the pregnancy test?
Test strips for determining pregnancy, as a rule, are equipped with a pair of dash-indicators. The first, control, indicates that the life of the device has not expired, whereas the second is intended to report the presence of pregnancy or the absence thereof.
There is no need to bet on the fact that a positive pregnancy test, which has a poorly colored second stripe, can not guarantee fertilization.
The repeated use of the test at short intervals is suggested. However, even if all the results of a pregnancy test are positive, there is no exclusion of the possibility of having a disease.
Principle of the pregnancy test
These devices are equipped with special reagents capable of responding to the presence in the urine of a woman's hormone hCG. It occurs in the body only in the case of the onset of fertilization, because it is produced by the placental organ. The level of hCG pregnancy test can not be measured, but it will necessarily report an increase in this indicator by the appearance of a second strip. Of course, every woman is interested in how soon the test will show pregnancy. We hasten to note that some of its species are able to give an answer almost instantly.
Causes of a positive pregnancy test
It is not uncommon and a situation in which the test shows the presence of fertilization, but it actually does not exist. This situation may be due to the following factors:
- an erroneous pregnancy test may be the result of the presence of malignant neoplasms in a woman;
- low quality of the test itself;
- incorrect interpretation of the results;
- seldom positive test and with a dead pregnancy, because in the blood of a woman there are traces of a hCG hormone that can "catch" an express test;
- the use of medicines containing a synthetic analogue of the hormone of pregnancy;
- it is also likely that when a miscarriage test will show pregnancy, again, thanks to the principle of its action;
- violation of the conditions of use or storage of devices for the establishment of fertilization.
It is worth noting that two strips on a pregnancy test can equally show false-positive and false-negative results. The latter is inherent in the situation in which a woman too early tries to learn about her situation, when the concentration of hCG is still too small.
Also the correctness of application of the device plays the role. So, for example, the term of the pregnancy test, namely, the evaluation of its result, should not be more than 5-7 minutes after immersion in urine.
Very difficult is the situation in which there is a positive test for ectopic pregnancy . Determine this can only one device, namely the test cassette INEXSCREEN. In other cases, a low content of the hormone HCG in the blood will not allow the usual test to indicate the existing threat.