Ovulation test paper, as the name suggests, is a tool that helps us predict the day of ovulation. To use this tool scientifically and effectively, it is important to know how it works. In each menstrual cycle of a woman, luteinizing hormone (LH) in the urine rises significantly 24-48 hours before ovulation. Ovulation test strips can be used to predict whether ovulation is approaching by monitoring LH in the urine. It is worth mentioning that ovulation is a physiological process, not an instant. Therefore, the result of ovulation test is not “yes” or “no”, but a gradual process. The urine ovulation test can only indicate whether LH is elevated, but not whether the follicles are ovulating. How should I use ovulation test strips scientifically? The egg starts to develop on the day of menstruation and you can usually start to prepare the test strips when your period is over. Starting from the 11th to 12th day of menstruation, you can use ovulation test strips to monitor your pregnancy morning and night. The key to ovulation is the presence of a strong positive, when LH reaches its peak, and ovulation can occur. When you see a weak positive, it does not mean that ovulation will occur, but you should continue to monitor and increase the frequency of monitoring to 3-4 test strips per day, after a strong positive appears, it means that ovulation will occur within 48 hours (usually within 24 hours), if the test shows negative again the next day, it means that ovulation has already occurred. After a strong positive test, it will gradually drop and return to a weak positive test, like a parabola, and it is most likely to conceive at this stage. The best practice is to record the time and place them neatly in order, so that you can observe the changes and determine when your LH is at its highest. In addition, it is important to store ovulation test strips correctly: test strips should be stored in a room temperature environment, away from light, and if placed in the refrigerator, they should be rewarmed before use. Proper urine collection: (1) Use a clean, dry container to collect urine; (2) Do not use morning urine; (3) The best time to collect urine is from 10 am to 8 pm; (4) Water intake should be reduced 2 hours before urine collection, as a diluted urine sample will hinder the detection of LH peak.