Hepatitis B surface antibody of 70mIU/mL is normal, which is a positive antibody, indicating protection against the hepatitis B virus. Hepatitis B surface antibody is one of the five clinical tests for Hepatitis B. When it exceeds 10mIU/mL, it is positive, indicating that there are antibodies that can resist the attack of Hepatitis B virus to a certain extent. When it exceeds 100mIU/mL, it is highly protective against the hepatitis B virus. 70mIU/mL is normal. The methods to detect hepatitis B surface antibody include ordinary hepatitis B penta and quantitative hepatitis B penta. Positive hepatitis B surface antibody does not need to worry too much, and if it is negative, you need to take hepatitis B vaccine again to stimulate the body to produce antibody.