How many days can the test strip detect pregnancy

How many days can the test strip detect pregnancy? Many friends who want to get pregnant or are afraid of pregnancy want to know, so we need to understand the test strip first. The test strip is a tool that people have developed to detect whether a woman is pregnant through urine. It is easy to use and easy to buy. Generally, there are two test results. If a colored strip appears in the control area of ​​the test strip, it means that you are not pregnant. If two strips appear, it means you are pregnant.

Using test strips to detect pregnancy is relatively convenient and quick, but it can only be used as a reference. Do not rely too much on the test strips because false positives or false negatives may occasionally occur. Therefore, if you want to test whether you are pregnant, you still need to go to the hospital for testing, which is the safest and most effective. Let us take a detailed look at how to use the test strips and how many days it will take to detect pregnancy so that we can help you.

Detection time

1 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.

2 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.

3 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.

Precautions

Dilute urine. Drinking too much water can dilute your urine and cause a false-negative result.

Performing the test in the morning or evening may have some effect on the results. The highest HCG value is generally found in morning urine, so many instructions recommend testing in the morning, but this is not absolute.

When testing, pay attention to the length of the test paper that is immersed in urine. Sometimes the length of urine that covers the test strip is too long, making the test result difficult to interpret.

Do not rely on test results to determine whether you are pregnant if you have recently been pregnant. Because HCG can remain positive for a long period of time after termination of pregnancy (after delivery, spontaneous abortion and artificial abortion).

Some illnesses and medications can cause false-positive results. Some tumor cells, such as hydatidiform mole, choriocarcinoma, bronchial carcinoma and renal cancer, can also secrete HCG.

Do not use expired test strips. Because chemical reagents lose their effectiveness over time, pay attention to the production date when purchasing.

Do not use test strips that are damp.

Have you all learned how many days it takes for the test strip to detect pregnancy? If you really want a baby, you must follow the instructions when using it. If it is not clear, you can test it again in two days, or go to the hospital for a more accurate blood test.