What is the pregnancy blood test for

Pregnancy blood check is chorionic gonadotropin, referred to as HCG, is a specific indicator of pregnancy, chorion is an important tissue of placenta, after pregnancy in women, this hormone secretion will be significantly increased, plasma and urine chorionic gonadotropin showed earlier, can be used for early pregnancy detection. It is mainly responsible for embryo and fetal blood supply, nutrition and metabolism, protect embryos from maternal immune rejection, promote follicular maturity, maintain pregnancy function. Early in pregnancy, if there is no doubling of growth, it is not excluded that the patient presents with a threatened abortion or miscarriage