The HCG test is a test to check the level of human chorionic gonadotropin, which can be divided into blood HCG test and urine HCG test depending on the test sample. In clinical practice, HCG test is mainly used for diagnosing early pregnancy and early pregnancy, diagnosing and observing gestational trophoblastic diseases, observing ectopic pregnancy and abortion efficacy, and observing the activity of uterine cavity residues after abortion.1. Diagnosing early pregnancy and early pregnancy: HCG will rise after women conceive, and the determination of blood HCG can diagnose whether conception has occurred. If the rate of increase of HCG is faster, ectopic pregnancy can be considered, and if HCG is decreasing, it can be considered as a sign of preterm abortion. The HCG concentration is significantly higher than that of normal early pregnant women. After corresponding clinical treatment, the HCG level decreases to the normal range, which indicates that the disease is under control; if it increases, it indicates that the treatment is incomplete; 3. observe the ectopic pregnancy and abortion efficacy: generally, after medication or surgical treatment, the blood HCG concentration can decrease to a certain extent, otherwise, treatment failure and incomplete abortion can be considered; 4. observe the activity of uterine cavity residues after abortion: whether it is medication abortion or artificial abortion If the activity is high, the uterine cavity residue activity can be observed.