Ectopic pregnancy professional medical term for ectopic pregnancy, ectopic pregnancy HCG does not have a fixed value, it is lower than normal pregnancy, and doubling bad, the occurrence of this situation to consider the possibility of ectopic pregnancy. HCG is a glycoprotein hormone secreted by placental trophoblasts, which doubles in about 1.7-2 days in the early stages of normal pregnancy, which is a sign of good fetal development. In ectopic pregnancy, due to poor formation of trophoblast cells, HCG is lower than in intrauterine pregnancy, and there is no exponential increase in the interval of 2-3 days measurement, which is a characteristic of the disease. HCG is an indicator of ectopic pregnancy, but it is not the only indicator, because a decrease in HCG and poor doubling can also be due to preeclampsia. Therefore, ectopic pregnancy should be diagnosed in combination with symptoms, signs and ultrasound.