The normal value of HCG at 48 days of pregnancy is 31,000-65,000 U/L, with an average value of 45,000 u/L. If it is within this range, it is normal. If the value is lower than normal, it indicates that there is a lack of HCG, and there is a chance of preterm miscarriage, so it is necessary to be treated with fertility preservation and therapy. Try to determine whether there is a doubling within 48 hours, if the doubling is obvious, it means that the fetus is developing very well, and pay attention to all the tests in the later period. If the doubling is not obvious, it indicates that there is pre-miscarriage. Prompt fetal maintenance is needed to ensure the stability and health of the fetus, even if the fetal heartbeat and buds have already appeared by this time. Since HCG is a crucial test, it is important to choose the timing of the birth control according to the situation, and it is important to follow the appointments and doctor’s orders in the second trimester for a detailed examination.