The best time to have a blood HCG test varies individually depending on the purpose of the test. If the purpose is to determine if you are pregnant, a blood HCG test is the earliest and most accurate way to test. A woman can have a blood test for HCG 8-10 days after ovulation or 28-30 days after menopause to determine if she is pregnant. However, high blood HCG may also be pathological, such as ectopic pregnancy, (malignant) staphyloma, chorionic epithelial cell carcinoma, seminoma, teratoma, ectopic HCG-secreting tumor, etc. In such cases, the best time for blood HCG test is the earlier the better, and if the pregnant woman is ectopic, she should seek medical attention immediately after menopause. In addition, women should try to have the blood HCG test in the morning and wear loose clothing to facilitate the test.