When is a pregnancy test strip most accurate?

Apr 19, 2022 Source: Cainiu Health
Disease description:

My husband and I have been trying to conceive for six months. This month, my period is one week late, and this morning I used a pregnancy test strip, which showed that I’m pregnant. However, the test showed no reaction when I repeated it tonight—could it be that the timing was off? When is the pregnancy test strip most accurate?

Doctor's answer (1)
Dr. Luo Li
In cases of delayed menstruation, pregnancy tests using urine test strips are generally more accurate when performed in the morning. These test strips detect the concentration of human chorionic gonadotropin (hCG) in urine to determine whether pregnancy has occurred. When menstruation is delayed by one week or more, hCG levels in urine are typically elevated. Morning urine is preferred for testing, as it contains the highest concentration of hCG, thereby yielding the most accurate results.