Description
The Hepatitis B Surface Antigen Blood Test detects the presence of HBsAg, a protein on the surface of the Hepatitis B virus (HBV). The presence of HBsAg in the blood indicates an active Hepatitis B infection, either acute or chronic.
Purpose of the Test
- Detect current Hepatitis B infection
- Identify individuals who may transmit the virus to others
- Screen blood donors, pregnant women, and at-risk populations
- Monitor treatment response in patients with chronic Hepatitis B
What the Test Measures
- HBsAg: The surface protein of the virus. A positive result indicates active infection, while a negative result suggests no current infection.
Why the Test is Important
- Early detection: Helps prevent the spread of Hepatitis B through timely diagnosis
- Infection monitoring: Determines if an infection is acute or chronic when combined with other Hepatitis B tests (core antibody and surface antibody)
- Guides medical care: Determines need for antiviral therapy or further evaluation
When to Order
Individuals may need this test if they:
- Exhibit symptoms of Hepatitis B, such as fatigue, jaundice, dark urine, or abdominal pain
- Are at high risk of infection (e.g., healthcare workers, people with multiple sexual partners, intravenous drug users)
- Are pregnant, to reduce risk of mother-to-child transmission
- Require screening before blood donation or medical procedures
Fasting not required.
