Hepatitis B surface antigen is greater than 250, indicating that there is hepatitis B virus infection, which is infectious. Hepatitis B surface antigen quantitative greater than 250, indicating that has been infected with hepatitis B virus, need to further check liver function, liver ultrasound, hepatitis B virus DNA and other related indicators to evaluate the severity of the disease, but also need to be combined with the other indicators of hepatitis B five to determine whether it is a major triple or minor triple. If the quantitative test of hepatitis B virus is also very high, it means that it is highly contagious, which can be transmitted through blood transmission, mother-to-child vertical transmission and sexual contact, you can receive hepatitis B vaccine to prevent this disease, and regularly check the level of surface antigen of hepatitis B to understand the strength of the contagiousness. Usually pay attention to rest and don’t overwork, regular examination of liver-related indicators can evaluate the health status, if necessary, anti-hepatitis B virus treatment, you can choose nucleoside analogues or interferon antiviral. Specific medication needs to be under the guidance of a doctor.