Are ovulation test strips reliable? Accuracy and error range 1. Accuracy Ovulation test paper is a convenient and fast ovulation monitoring tool. It determines whether a woman is ovulating by detecting changes in ovarian gonadotropin (LH) levels in urine. According to different brands of test strips, the statistical results of their accuracy vary, but they are generally between 95% and 99%. In addition, the accuracy of ovulation test strips is also affected by many factors, such as the choice of test time, specimen collection method, some medications and special health conditions. Therefore, before using ovulation test strips