The HCG test is used to diagnose pregnancy in clinical practice, because the HCG value is not affected by diet, and it is possible to do the test with or without fasting as long as the diet is normal. The HCG test includes blood HCG test and urine HCG test, the blood HCG test should be performed after 10 days of intercourse, too early may affect the result, and the urine HCG test should be performed 2 weeks after intercourse. Compared with the urine HCG test, the blood HCG test has a higher accuracy rate and is less interfered by external factors.