There are many items that can be checked by ultrasound. In early pregnancy, ultrasound can be used to check whether the gestational sac is in the uterus or outside the uterus. During pregnancy, ultrasound can be used to look at the development of the fetus, the amount of amniotic fluid, and the development of the fetus’s heart. Ultrasound during non-pregnancy can determine if there are uterine fibroids, ovarian cysts, pelvic inflammatory disease, endometritis. Ultrasound can also check for breast diseases, such as breast hyperplasia, mastitis and breast cancer. Ultrasound can monitor the development of follicles in the ovaries and whether they are ovulating during the ovulation period. If you are planning to have a child and find that the follicles are ovulating and arrange for intercourse in time, the chances of getting pregnant increase. Ultrasound has been widely used and it is best to choose the right test according to the specific situation. Note that ultrasound examination may need to fasting, may also need to hold urine, specific circumstances can consult the doctor, ultrasound examination before the need for precautions.