HCG, also known as human chorionic gonadotropin, is a glycoprotein secreted by the trophoblast cells of the placenta. The HCG test usually consists of urine HCG and blood HCG tests, which are more accurate because they are not affected by diet and are specific. In addition, the blood HCG test will be a little more accurate than the urine HCG test. HCG can maintain the life span of the menstrual corpus luteum, which increases the size of the menstrual corpus luteum to become the corpus luteum of pregnancy and increases the secretion of steroid hormones. Also HCG promotes the conversion of androgens to estrogen and stimulates the formation of progesterone to maintain pregnancy. Insufficient doubling of HCG is often indicative of poor embryonic development and the possibility of spontaneous abortion. In case of ectopic pregnancy, a gradual increase in HCG indicates the possibility of ectopic pregnancy rupture and hospitalization for surgery is recommended as soon as possible.