The Hepatitis B Antigen Test detects the presence of specific antigens (proteins) produced by the Hepatitis B virus (HBV). These antigens indicate that the virus is actively replicating in the body, and their presence can help determine whether a person is infected with Hepatitis B and if they are contagious.

Hepatitis B Surface Antigen (HBsAg): This is the most common antigen tested in Hepatitis B screening. A positive result indicates an active infection with the Hepatitis B virus, whether acute or chronic. If the antigen is present, the person is considered infectious and they may be able to spread the virus to others.

Why It’s Important:

The Hepatitis B Antigen Test is used to:

• Diagnose Active Hepatitis B Infection: If HBsAg is detected, it confirms the presence of the virus and helps assess whether the infection is acute or chronic.
• Monitor Chronic Hepatitis B: For individuals with chronic Hepatitis B, these tests help monitor disease progression and the effectiveness of treatment.
• Screen for Hepatitis B in High-Risk Populations: This test is commonly used for individuals who are at higher risk of Hepatitis B infection, such as healthcare workers, people with multiple sexual partners, people who inject drugs and those born to mothers with Hepatitis B.

Identifying Hepatitis B early allows for timely intervention, reducing the risk of liver damage and preventing transmission to others.