The ovulation test is mainly used to detect the peak level of luteinizing hormone to predict whether ovulation is occurring or not. It is mainly used to qualitatively detect the change of luteinizing hormone content in women’s urine in vitro to determine the time of ovulation and the “safe period” in women’s menstrual cycle. A normal woman ovulates every month. An egg matures in the ovary, is discharged from the ovary, and is transported to the uterus via the fallopian tube, where pregnancy occurs through the union of a mature egg with a sperm in the fallopian tube. Sperm can survive in the female reproductive tract for about 24-72 hours, while an egg is suitable for fertilization only about 24-36 hours after ovulation. Therefore, the fertile period is 2-3 days before and 1-2 days after ovulation, i.e. 4-6 days before and after the day of ovulation. To test for pregnancy, women can test for human chorionic gonadotropin in their bodies, either through early pregnancy test strips or by going to the hospital for blood or urine HCG tests to determine if they are pregnant.