HCG is the abbreviation of human chorionic gonadotropin, how much to check to determine the pregnancy, each hospital uses different units, the conversion unit is also different, blood HCG > normal value of 10ug/L, beta-HCG > normal value of 3.1ug/L pregnancy is the most likely. When you get the test sheet, look at whether the value is greater than the reference value behind, greater than consider the possibility of pregnancy, less than one is not pregnant, the second is too early to check. On the 6th day after fertilization, the secretion of chorionic gonadotropin, which can be measured from the maternal serum after 1 day, increases rapidly and becomes the most sensitive method for diagnosing early pregnancy. If the HCG doubles on the next day, the initial judgment is that the fertilized egg is well developed. You can continue to wait until about 7 weeks of menopause for an ultrasound examination to observe whether there is a fetal heartbeat, and you need to be checked at any time if there is abdominal pain or bleeding during this period to avoid ectopic pregnancy or preterm abortion. Elevated HCG does not only mean pregnancy, some diseases can also be elevated. It is determined that elevated blood HCG and delayed menstruation are the most likely cause of pregnancy, and the final diagnosis of early intrauterine pregnancy is an ultrasound examination that reveals the gestational sac. If the gestational sac is not visible on ultrasound, firstly, ectopic pregnancy is highly suspected, and secondly, other causes of HCG elevation cannot be ruled out, so further examination and close observation are needed.