Why is morning urine used for early pregnancy tests?

Patient's question:

I got married last year. Recently, I've been experiencing lower abdominal pain, especially during my period. I'm very worried it might affect fertility, and I also feel extremely cold and afraid of the cold. Why is morning urine used for early pregnancy tests?

Doctor's answer:

Hello, early morning urine generally has a higher value of human chorionic gonadotropin (HCG), making the test more accurate. If your period is delayed, the chance of a positive pregnancy test using early pregnancy strips is very high. The factors you mentioned do have some impact, but they generally do not significantly affect the confirmation of pregnancy. It is important to get a clear result through testing.
Hello; in this case, you can check the five hormones of the sex hormone profile on the third day of your period. Fasting blood draw is the best method. If your period has been delayed for a long time, you can check at any time.

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