How long does it take to take a pregnancy test?

Early pregnancy generally refers to the early stages of pregnancy. In addition to routine check-ups in the hospital, early pregnancy test kits are generally used when testing early pregnancy at home. Of course, there will be errors in early pregnancy tests, so you must choose the best time for early pregnancy tests so that the results of early pregnancy tests are more accurate. In addition, you must also pay attention to the selection of test materials and try not to use expired test products. How long does it take to take an early pregnancy test?

1. Test time

The working principle of early pregnancy self-test 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. It will not become increasingly obvious until 10 to 14 days. Although many types of early pregnancy test strips indicate that women can do a pregnancy self-test one day after missing their normal menstrual period, in fact, not all pregnant women emit HCG hormones at the same rate and in the same amount. This varies from person to person. If a urine test is done too early, a negative result may be false. Therefore, the best time to do an early pregnancy test is two weeks after your period is late, so that the result will be more accurate.

2. Test Principle

It turns out that after the sperm and egg combine in the fallopian tube to become a fertilized egg, it takes about 4 days to reach the uterine cavity, and after another 2 to 3 days, the fertilized egg implants in the uterus. After implantation, the fertilized egg secretes human chorionic gonadotropin (HCG) during its development, and HCG is excreted in the urine of the pregnant woman. The use of early pregnancy test kits to assist in the diagnosis of early pregnancy utilizes this clinical mechanism and completes the test based on the principle of dot immunofiltration in immunology combined with a color development reaction. The HCG antigen in the urine combines with the specific antibody coated on the plate to form an antigen-antibody complex, which infiltrates with the urine into the color-developing area and the result is displayed. If we calculate based on a 28-day menstrual cycle, if you have sex during the ovulation period and conceive, you can get pregnancy information from the early pregnancy test board as early as the 26th day of your period.

3. Note

If the early pregnancy test paper you bought is stored for too long (more than 1 year), or if it gets damp and is not kept at normal room temperature (should not be refrigerated), it may become invalid and result in a false negative test result. If the pregnancy has just begun, or there is a possibility of ectopic pregnancy, the HCG level in the body is generally low. The test sample needs to be left to stand for more than 3 minutes (generally only 1 minute is needed), and it is necessary to carefully identify whether there is a weak positive - the color band in the test area only appears faintly.