HCG usually costs about 60-70 dollars. HCG, or human chorionic gonadotropin, is used to determine whether a patient is pregnant or not. If the patient has regular menstruation but suddenly has delayed menstruation and has not taken proper contraceptive measures, in this case, the first thing to do is to take blood to check the HCG value to rule out delayed menstruation caused by pregnancy. If the HCG level rises, the delayed menstruation is caused by pregnancy. If the blood HCG value rises and the gynecological ultrasound indicates a suspicious mass outside the uterus, including this case, we need to further combine with the blood HCG value to decide the next step of treatment.