The follicle is the basic unit of female reproduction, cyclic ovulation is the basis for conception, and accurate prediction of ovulation plays a key role in planning pregnancy and eugenics. Therefore, ovulation monitoring can be performed for women who intend to conceive in order to choose the right time for intercourse. In addition, for women who have been infertile for a relatively short period of time, we also prefer ovulation monitoring as a treatment method after ruling out male factor infertility, because it is non-invasive and easy to perform for the patient and easy for the patient to accept. In addition, we need to accurately predict the time of ovulation in order to choose the time of artificial insemination, so ovulation monitoring is also needed. Currently, we often use vaginal ultrasound combined with urinary LH measurement to monitor ovulation. This is because on one hand, the size of the follicles can be dynamically observed morphologically under vaginal ultrasound, and on the other hand, the urine LH test can reflect whether the hormone levels in the body have reached the pre-ovulatory peak. Only by accurately predicting the time of ovulation can the timing of conception be correctly grasped. I hope more people can benefit from it!