HCG test is a method to determine whether a woman is pregnant by measuring the HCG value in her blood. It is usually done in 8-10 days after sexual intercourse, and can be done in the morning, usually without fasting, and drinking and eating have little effect on the results.HCG test can not only diagnose early pregnancy, but can also identify ectopic pregnancy and abnormal pregnancy. In pregnancy, urine HCG value will increase, usually in the 35-40 days after pregnancy can reach more than 25U/ml. Blood HCG test can be more sensitive and accurate in determining whether there is pregnancy or not than ordinary urine test with early pregnancy test paper, and its accuracy rate is over 99%. Besides, you should pay attention to make sure you have enough sleep, don’t be tired, and avoid excessive tension and anxiety before the HCG test. Try not to take any medication on your own 3 days before the test, so as not to affect the result of the test.