A positive surface antibody to hepatitis B in a pregnant woman is normal. This is an indication that the pregnant woman has protective antibodies in her body, which can effectively block the infection of the hepatitis B virus and have some benefits for the fetus. Human contact with hepatitis B patients, or having been vaccinated against hepatitis B will stimulate the body to produce protective antibodies, that is, a positive result for hepatitis B surface antibodies. When re-infected with the hepatitis B virus, it can effectively prevent hepatitis B infection. If a pregnant woman has a positive surface antibody, it at least indicates that she does not have or is not a hepatitis B patient and will not transmit it to the fetus through intrauterine infection or delivery through the birth canal. Hepatitis B surface antibodies can be further tested quantitatively, and higher antibody titers indicate greater protection. However, hepatitis B surface antibodies are not constant and will gradually decline over time, or even turn negative, so regular testing of the five hepatitis B tests is required. If the hepatitis B surface antibodies are negative, the hepatitis B vaccine can be revaccinated.