Dominant follicles but no ovulation

B-ultrasound examination showed that there were dominant follicles but no ovulation, which may be because the follicles were not mature. Dominant follicles refer to follicles with follicle diameter greater than 10mm and protruding from the ovarian surface. The follicles would rupture when they developed to 18~25mm, which may be caused by insufficient hormone level in the body. Ovulation can be promoted by injection of ovulation promotion needle.