| Definition |
A quantitative hepatitis B virus (HBV) surface antigen (HBsAg) test is an in vitro diagnostic device intended for prescription use for the quantitative determination of HBsAg in human serum, plasma, or other matrices specimens from individuals with HBV infection as an aid in the management of HBV-infected individuals including identifying patients who may benefit from treatment with appropriate antiviral therapies in accordance with the approved therapeutic product labeling. |