The Hepatitis B Surface Antigen (HBsAg) test detects proteins on the surface of the hepatitis B virus. A positive result indicates an active hepatitis B infection.
Category: Infectious Disease
Also known as: hbsag, hepatitis b surface antigen, hbs ag, hep b surface antigen, hepatitis b antigen
Reference range: 0–0.05 IU/mL (Source: ABIM)
Standard unit: IU/mL
High values may indicate
A positive (reactive) HBsAg result indicates current hepatitis B infection, which may be acute or chronic.
Low values may indicate
A negative (non-reactive) HBsAg result means no active hepatitis B infection is detected.