Normal HCG values in the general population range from 0-10mIU/ml. In the case of pregnant women, HCG <10mIU/ml is generally considered as fetal arrest and may also be a sign of trophoblastic disease curettage. HCG is a glycoprotein hormone secreted by the syncytial trophoblast as human chorionic gonadotropin, a hormone unique to female pregnancy, which maintains the presence and exuberant secretion of the corpus luteum of pregnancy to ensure normal pregnancy. HCG begins in the 2nd week after fertilization It appears in the pregnant woman's blood, peaks at 9-11 weeks of pregnancy, and then gradually decreases. When a woman's HCG level is <10mIU/ml, it means that she is not pregnant, or the test may be too early to detect an accurate HCG level. If pregnancy is confirmed and the HCG value is <10mIU/ml at the time of rechecking, it indicates that the embryo may have stopped developing and needs to be cleared to remove the remaining embryonic tissue in the uterine cavity as soon as possible to avoid infection or uterine adhesions. In addition, when a woman has trophoblastic disease, the blood HCG will be abnormally high and show symptoms such as pregnancy reaction and irregular vaginal bleeding. If the HCG is <10mIU/ml on recheck, it indicates that the serum HCG is stable and decreasing after active treatment, suggesting a possible cure.