HCG refers to human chorionic gonadotropin, which is mostly elevated in normal pregnancy, ectopic pregnancy, incomplete abortion and gestational trophoblastic disease. 1. Normal pregnancy: when the sperm and egg combine to form a fertilized egg, and the fertilized egg normally deposits in the uterine cavity, human chorionic gonadotropin will start to be secreted, and the value will be doubled every other day under normal circumstances. 2. Ectopic pregnancy: for ectopic pregnancy, the fertilized egg will also cause the secretion of human chorionic gonadotropin when it is deposited outside the uterine cavity, but the growth of this value is relatively slow. 3. Incomplete abortion: after abortion, if the human chorionic gonadotropin in the body is still high, it may be due to incomplete abortion, mostly because of the residual chorionic tissue in the uterine cavity, which usually needs to be cleared. 4. Gestational trophoblastic diseases: For those who suffer from gestational trophoblastic diseases such as gravidarium, erosive gravidarium, choriocarcinoma, etc., it will also lead to elevated levels of human chorionic gonadotropin, and the value is often significantly higher than that of a normal pregnancy. Therefore, if elevated human chorionic gonadotropin levels are detected during a checkup, it is necessary to complete the relevant tests in a timely manner, and develop the next treatment plan according to the specific situation after the doctor’s consultation.