Human chorionic gonadotrophin is an important indicator to judge a woman's pregnancy. This hormone is secreted by placental tissue. On the 6th day after fertilization, trophoblast cells begin to secrete trace amounts of HCG. An ectopic pregnancy should be suspected if the HCG does not double or reach the desired pregnancy value.

　　In addition, trophoblast neoplasms should be highly suspected if levels of HCG are abnormally elevated above the pregnancy peak and remain elevated.

　　Human plush membrane gonadotropin is somewhat normal

　　Human chorionic gonadotrophin, also known as HCG, is secreted by trophoblast cells in the placenta and is a glycoprotein that maintains pregnancy. For women who are not pregnant, the range of human chorionic gonadotrophin is 0~5U/L, which varies according to the constitution of each person.

　　For pregnant women, a small amount of HCG was secrete on the 6th day after fertilization. Serum HCG concentration reached a peak (50000~100000U/L) at the 10th week of gestation, and then decreased rapidly. In the middle and third trimests, HCG was only 10% of the peak. For patients with trophoblast disease, HCG results are often above 1000000U/L.