Ovulation test strips predict whether ovulation is occurring by detecting the peak level of luteinizing hormone, which is simple and easy to operate. They can be used to detect luteinizing hormone in women’s urine, thus determining the time of ovulation and the safe period for the purpose of choosing the optimal time for conception or the use of safe-period contraception. Women can test their urine around 10 a.m. In addition to morning urine, water intake should be reduced within 2 hours of testing. After using ovulation test paper, it is advisable to read it within 10 minutes to avoid a longer period of time affecting the accuracy. If the test paper shows a red line, it means that it is early to ovulation, you can test continuously for 5-10 days and observe the change of the red line. If the second red line is slowly visible from none, the ovulation test paper is strongly positive when it shows the brightest red line, which is the best time for ovulation, indicating that ovulation starts within 1-2 days afterward, and an additional test can be taken during the normal collection time. Conjugal life during this period can increase the chances of conception. In addition, ovulation test strips should be careful not to get damp or touch the reaction membrane before use, the lid should be tightened immediately after the jar is removed, and the test strips should be used within the expiration date. HCG in urine can interfere with the test results, so ovulation test strips are not suitable for pregnant women, if the LH peak occurs for several days, you should first test whether you are pregnant.