Ectopic pregnancy, medically known as ectopic pregnancy, that is, the fertilized egg is deposited outside the uterine cavity. When miscarriage or rupture occurs, there is no difficulty in diagnosis; however, in the early stage of ectopic pregnancy, due to the lack of obvious clinical manifestations, the diagnosis mainly relies on auxiliary examinations to make it clear, commonly used, such as blood HCG measurement, vaginal ultrasonography. HCG, the full name is human chorionic gonadotropin, started to be secreted by the syncytial trophoblast cells of the placental chorionic villus 10-14 days after conception, which is the most sensitive method to diagnose early pregnancy, and is crucial to the early diagnosis of ectopic pregnancy. In general, the level of HCG in patients with ectopic pregnancy is lower than that of normal intrauterine pregnancy. In fact, it is very difficult to judge ectopic pregnancy based on a certain blood HCG value, in other words, there is no certain standard HCG value for ectopic pregnancy. In other words, there is no certain standard for HCG value. Generally, we need to continuously monitor the patient’s blood HCG value dynamically, for a normal intrauterine pregnancy, when the pregnancy is 6-8 weeks old, the blood HCG value should increase at a rate of 66% per day, such as the blood HCG value increases at a rate of less than 66% in 48 hours, suggesting that the pregnancy is not good after the pregnancy, therefore, if the doubling time of the blood HCG value is less than 1.4 days, the possibility of ectopic pregnancy is extremely small (the time needed for the doubling of the blood HCG value is less than 1.4 days, basically not to be considered). So if the doubling time of blood HCG value is less than 1.4 days, the possibility of ectopic pregnancy is very small (it takes less than 1.4 days to double the blood HCG value, ectopic pregnancy is basically not considered). Vaginal ultrasound, a type of ultrasound in which a long vaginal probe is inserted into the vagina for examination, has a clearer view than transabdominal ultrasound and is more accurate in diagnosis. Ectopic pregnancy can be diagnosed when the blood HCG is positive, the ultrasound suggests that the uterus is empty, and an abnormal mass is detected on one side of the adnexa, in which blood flow is visible, or fetal buds and pulsatile pulsations are visible; or when the vaginal ultrasound shows the intrauterine foetal sac directly after 4 weeks of menopause (or the transabdominal ultrasound shows the intrauterine foetal sac directly after 5-6 weeks of menopause), the intrauterine pregnancy can be clearly defined, and thus ectopic pregnancy can be ruled out (although it is possible that there may be simultaneous conception in the intrauterine cavity and outside the uterus, the chance is extremely low). (although there may be simultaneous intrauterine and extrauterine pregnancies, the chances of this are extremely low). Clinically, blood HCG value and vaginal ultrasound examination are usually combined to diagnose, when blood HCG>2000iu/l, vaginal ultrasound did not detect the intrauterine fetal sac, the diagnosis of ectopic pregnancy is basically established.