HCG refers to human chorionic gonadotropin, which is usually secreted by syncytial trophoblast cells six days after conception, resulting in elevated HCG in the urine. If menstruation is usually regular, it is recommended to test urinary HCG more than seven days after menopause. Meanwhile, changes in blood HCG level can provide a basis for diagnosing ectopic pregnancy, as follows: 1. Continuous measurement: for patients suspected of having ectopic pregnancy, continuous measurement of blood HCG should be done. If the increase in blood HCG is less than 50% at an interval of 48 hours, the possibility of ectopic pregnancy should be considered; 2. Blood HCG level: most women with ectopic pregnancy have blood 3. doubling time: the doubling time of blood HCG in normal women with early intrauterine pregnancy is about 1.4-2.2 days; the doubling time of blood HCG in ectopic pregnancy is about 3-8 days. The diagnosis of ectopic pregnancy can be confirmed by ultrasound, laparoscopy and retrovaginal fornix aspiration, etc. If no gestational sac is detected in the uterine cavity and an abnormal hypoechoic area is detected in the parametrium, and the germ and primordial ventricular pulsation are seen, the diagnosis of ectopic pregnancy can be confirmed; laparoscopy is the gold standard for the diagnosis of ectopic pregnancy and can be performed at the same time. Posterior vaginal fornix aspiration is suitable for patients suspected of having intra-abdominal bleeding. All of the above detection methods should be performed in a regular tertiary hospital, and the diagnosis of ectopic pregnancy should be treated promptly to avoid the symptoms of hemorrhage.