Ovulation test paper is mainly through the detection of luteinizing hormone in the urine to determine whether ovulation occurs, 10 consecutive days of ovulation test paper strong positive, indicating that the luteinizing hormone has been in a high level of state, there are gynecological endocrine disorders may be. The accuracy of ovulation test paper is not very high, easily affected by various factors, such as taking ovulation drugs, emotional instability and so on. Then again, the use of test strips is not standardized, there is no comparison before and after, must use the same batch of test strips. It is recommended to go to the hospital for ultrasound to measure ovulation after a strong positive test, which is more accurate, and if necessary, go to the hospital on the 2nd-5th day of menstruation to check the sex hormone six to rule out endocrine disorders. Some women who have already gotten pregnant after intercourse may also experience persistent strong positives on ovulation test strips, in which case they need to check urine pregnancy test or blood human chorionic gonadotropin to be sure.