Fasting is not required when testing for hepatitis B because none of the relevant items involve lipid or blood sugar. After eating, there is a certain effect on blood fat and blood sugar, but there is not much effect on the liver function of hepatitis B, hepatitis B five items and the quantitative DNA of hepatitis B virus, and alpha-fetoprotein, so these items can be checked after eating. If there is a requirement to check blood glucose or blood lipids after meals, the overall view should be fasting. However, if there is no blood fat and blood sugar program, only these items related to hepatitis B, you can carry out the relevant examination after meals. Hepatitis B test mainly refers to the blood test, if the hepatitis B test with liver ultrasound, this time you need to fasting, because after eating, the gastrointestinal tract can contain food and gas, these things will affect the exploration of the liver.