Fasting is usually not required for the Hepatitis B antibody test in children, and eating food will not affect the expression of Hepatitis B antibody in children. The Hepatitis B antibody test for children is usually performed using the Hepatitis B Penta test, which can clarify whether the body is infected with the Hepatitis B virus and whether the Hepatitis B antibody titer is sufficient. The antibodies in the Hepatitis B panel include Hepatitis B surface antibody, Hepatitis B core antibody, and Hepatitis B e antibody. Among them, Hepatitis B surface antibody is a very important indicator, which is positive when the body has been vaccinated with Hepatitis B vaccine and immunized successfully. In addition, it may also be positive when the person has been infected with hepatitis B virus but has been cured and is in the recovery period of hepatitis B virus. Positive e-antibodies indicate that the person is currently in a stable stage of hepatitis B virus infection. Positive core antibodies indicate that the body is infected or has been infected with the hepatitis B virus. All of the above items are not affected by food, so there is no need to test on an empty stomach, but if you need to check liver function at the same time, this test is more affected by diet, so it is recommended to test on an empty stomach in the morning.