You can have the hepatitis B half-pair test without fasting. Fasting is not required for the Hepatitis B half-pair test alone. Hepatitis B two-half test mainly detects hepatitis B surface antigen, hepatitis B antibody, hepatitis B e antigen, hepatitis B core antibody, hepatitis B e antibody, whether or not fasting has no effect on the results of hepatitis B two-half test. However, if you are having a liver function test at the same time, you need to fast, because eating may cause liver function abnormalities, such as an increase in transaminases, which may affect the results. Hepatitis B two-half pair test is an important test to determine whether you are infected with the hepatitis B virus. Especially patients with hepatitis B should pay attention to regular review.