The normal value of HCG at 10 days of pregnancy is 50-500 U/L. HCG, or human chorionic gonadotropin, is an indicator commonly used in clinical practice to monitor the development of pregnancy. HCG production begins when a normal fertilized egg is laid, i.e., when the trophoblast layer of the fertilized egg is formed on the 6th day after ovulation. Peripheral blood HCG can be measured about 1 day after the fertilized egg is laid, rising 1-fold every 1.7-2 days, reaching 100 U/L on the 14th day after ovulation, reaching a peak (15,000-200,000 U/L) on the 8th-10th week of gestation, and declining rapidly thereafter. In the middle and late stages of pregnancy, HCG is only 10% of its peak. If the HCG value is low, it may be a sign of embryonic development that does not correspond to the last menstrual period and requires recalculation of the last menstrual period; it may also be a sign of poor embryonic development or even fetal arrest (free-flowing miscarriage), which then leads to early miscarriage. If the measurement does not rise exponentially at an interval of 2-3 days, ectopic pregnancy should be suspected. At this time, the patient needs to ensure sufficient rest, and the HCG value can be rechecked again under the guidance of the doctor. If the HCG value is significantly higher than normal, it indicates that there may be an abnormal pregnancy possibility, such as gravidity, and the pregnant woman should immediately go to the hospital to improve other tests, such as gynecological ultrasound, to confirm the diagnosis and undergo surgical treatment, etc.