How Long After Birth Can a Child Be Tested for Hepatitis B Surface Antigen and Antibody?

Question

How Long After Birth Can a Child Be Tested for Hepatitis B Surface Antigen and Antibody?

Answer

Hello, there is no age limit for testing Hepatitis B surface antigen and antibody; only a small amount of blood is needed for the test. In your baby’s case, since two doses of the Hepatitis B vaccine have already been administered, it is usually sufficient to produce antibodies, and the third dose is just for reinforcement. If you have any questions, feel free to contact us anytime. Wishing you well.