What is the reason for the weak positive result of the ovulation test strip after a strong positive "aa" during the ovulation period?

Patient's question:

No

Doctor's answer:

One to two days before the ovulation period is about to arrive, the secretion of LH (luteinizing hormone) changes from weak to strong, and the ovulation test strip shows a weak positive gradually turning into a strong positive. When the ovulation period truly arrives, the body's LH levels decrease, and the ovulation test strip changes from a strong positive to a weak positive. Therefore, this is the principle behind the ovulation test strip.