The HCG test does not require fasting, but is done in a fasting state, mainly for tests that can be interfered with by dietary factors. The elevated chorionic gland promoting hormone value in the body is relatively constant after pregnancy and does not increase or decrease due to dietary factors. The HCG test is mainly used to determine whether a woman is pregnant at an early stage, and it can be done by blood test as early as 7-10 days after intercourse, but it is generally recommended to do this test about 3-5 days after the delay of menstruation. When used to evaluate the efficacy of treatment for these diseases, multiple tests are usually required to observe the decline in HCG values.