The test to monitor ovulation is called follicular monitoring, which usually lasts for about 7~10 days, depending on the woman’s menstrual cycle and follicular development.
Follicle monitoring is mainly used for ovulation disorders or infertility and other diseases. It usually starts on the 10th~12th day after the start of menstruation, and the monitoring is done every 1~2 days for 3~4 consecutive times to record the whole process of follicle development and ovulation completely.
Normally this process takes about 7~10 days. When the ultrasound detects that the follicle is 18mm large, it means that the follicle has matured and will ovulate in the next 1~2 days. When the follicle shrinks more than 5mm and the inner wall collapses it indicates ovulation.
Follicle monitoring needs to be carried out in a specialized hospital, and the specific time needs to be judged by the doctor in conjunction with your own situation.