The Hepatitis B Surface Antigen (HBsAg) test is a blood test used to detect the presence of Hepatitis B surface antigen in the blood. The test is important because it plays a crucial role in diagnosing Hepatitis B infection, screening individuals for HBV exposure, monitoring disease progression and treatment response, assessing vaccine effectiveness, preventing transmission, and supporting public health initiatives to control Hepatitis B. Early detection through HBsAg testing is key to improving outcomes for individuals infected with HBV and preventing the spread of the virus to others.
