How does a pregnancy test stick work? Is it necessary to use morning urine for a pregnancy test stick?

Many people like to use pregnancy test sticks to detect whether they are pregnant. How can a small pregnancy test stick tell whether you are pregnant? And the instructions say that it is best to use morning urine. What is going on? What is the principle of pregnancy test sticks? Is it necessary to use morning urine for pregnancy test sticks?

What is the principle of pregnancy test stick

The pregnancy test stick is used to test whether a woman has human chorionic gonadotropin in her body. General pregnancy test agents use the reaction of single and multiple HCG antibodies in the device binding to antigens in urine to determine whether the woman is pregnant or not.

Human chorionic gonadotropin (HCG) αβ, synthesized by syncytial trophoblasts. This hormone is produced by the placenta and generally appears in the urine a few days after pregnancy, but due to the small amount, it cannot be detected by test strips at the beginning, and it will become increasingly obvious after 10 to 14 days (HCG values ​​can also be measured through blood tests, and they are much more accurate).

How to read pregnancy test stick

Not pregnant: Only one control line appears, indicating no pregnancy.

Pregnancy: If two lines appear, that is, both the control line and the test line are colored, and the test line is obviously clear, it means that you are pregnant; if the control line is obviously clear and the test line is very light, it means that you may be pregnant. Please use a new pregnancy test stick to collect morning urine and retest every two days.

Invalid: No control line appears within 5 minutes, indicating that the test is invalid or failed.