Hepatitis B surface antigen usually refers to hepatitis B surface antigen, 4000iu/ml whether serious need to be judged according to the condition, if the patient is a hepatitis B carrier, generally not serious, if the patient is cirrhosis or liver cancer patients, it is more serious. Hepatitis B surface antigen 4000IU/ml can only show that there is hepatitis B virus in the patient’s body, and the number of hepatitis B virus is relatively large, but it can’t be used as a criterion for judging whether the condition is serious or not. The severity of the patient’s condition needs to be judged according to the liver function damage, if the patient carries out liver function tests. If the patient’s liver function is normal, it is mostly considered that the patient is a hepatitis B carrier, and at this time, the patient’s hepatitis B surface antigen 4000IU/ml is usually not serious. If hepatitis B leads to cirrhosis or liver cancer, when the patient undergoes the hepatitis B two half examination, hepatitis B surface antigen 4000IU/ml, and the patient’s liver function is abnormal, it is a more serious situation. In addition, patients with chronic hepatitis B or acute hepatitis B can also lead to hepatitis B surface antigen 4000iu/ml, at this time whether the seriousness of the patient needs to consult a doctor in a timely manner, the doctor will judge the patient’s condition.