Hepatitis B Surface Antigen Neutralization

**Semantic type:** Laboratory Procedure

**Definition:** An assay used to confirm the presence of Hepatitis B virus in a blood sample. Following repeated positive results by a virus-specific enzyme immunosorbant assay, free antibodies specific for Hepatitis B surface antigens (HBsAg) are added to the assay and should react with the virus and block a subsequent enzyme immunosorbant assay.

**Synonyms:** - HBsAg Neutralization