The blood test for hepatitis B patients is mainly to check hepatitis B two-to-one half, liver function, hepatitis B virus HBV-DNA, methemoglobin and blood cell analysis. Through the liver function test, the degree of liver damage can be grasped. Through the five tests of hepatitis B, the changes of hepatitis B surface antigen, hepatitis B surface antibody, hepatitis B e antigen, hepatitis B e antibody and hepatitis B core antibody can be observed. Through the hepatitis B virus HBV-DNA test, the hepatitis B viral load can be grasped. Through fetoprotein examination, primary liver cancer can be detected early. Through the blood cell analysis examination, if there is a decrease in platelets and white blood cells, you can observe whether there is a development trend of cirrhosis. The above tests are recommended to be checked once every six months if the disease is stable, and once every three months if it is active.