How many days can a pregnancy test paper be used?

Nowadays, people use pregnancy test strips to detect whether they are pregnant. The accuracy of pregnancy test strips is still very high, but sometimes the depth may be different depending on the time of day. This may be related to the short duration of pregnancy. When you just get pregnant, the test color will definitely be very light, and the pregnancy test strips may be able to detect it very early. In order to be sure, people usually test again after a few days.

Pregnancy test strips are a common method used to test whether a girl is pregnant. This method is not only easy to use, but also does not require going to the hospital for examination. It can also detect pregnancy, thereby reducing costs.

Early pregnancy test strips are products designed to help women detect whether they are pregnant. In general, there are two types of results for early pregnancy test strips: drop urine into the detection hole on the test strip. If a colored band appears in the control area of ​​the test strip (some test strips appear red, some test strips appear blue), it indicates a negative result, indicating that you are not pregnant; conversely, if a clear colored band appears in the detection area, it indicates a positive result, indicating that you are pregnant. This test has the advantages of being rapid, convenient, sensitive and highly specific. Early pregnancy test strips can only be used as a preliminary screening test. Do not rely on them too much, because false positives or false negatives may occur when using early pregnancy test strips.

The working principle of self-testing pregnancy using early pregnancy test strips is to detect the HCG value, that is, the value of human chorionic gonadotropin. This hormone is produced by the placenta and usually appears in the urine a few days after pregnancy. However, due to the small amount, it is difficult to test it at the beginning and it becomes increasingly obvious after 10 to 14 days. (HCG values ​​can also be measured through blood tests, which are much more accurate). Neither too early nor too late will have good results.

It is generally recommended to use the first urine test in the morning for women who have just become pregnant, as the results are more accurate. But for women who have been pregnant for some time, urine from any time of the day can be used for testing.

It usually takes about 7 days from intercourse to pregnancy, which means that pregnancy can be tested on the day of pregnancy (equivalent to 7 days after intercourse).

Test results

1 Negative: A purple-red line appears in the test area (control line C), indicating no pregnancy.

2 Positive: Two purple-red lines appear in the test area (control line C and test line T), indicating pregnancy. The color intensity of the test line at different stages of pregnancy changes with the change of HCG concentration.

3 Invalid: No purple-red line appears in the test area or only one purple-red line (test line T line) appears in the test area, indicating that the test failed or the test paper is invalid and should be retested.

From the introduction in the article, we can understand that the pregnancy test paper can detect the increase of a hormone in our body to determine whether we are pregnant. There are three main types of test results: positive, negative and invalid. If the test result is positive, it proves that you are pregnant. Then you should pay more attention to your living habits and diet to better ensure the health of the fetus.