Hepatitis B Surface Antigen (HBsAg)

About the Test

The HBsAg test is a blood test used to detect the presence of hepatitis B surface antigen in the bloodstream. This antigen is a protein found on the surface of the Hepatitis B virus. Its presence indicates that a person is infected with hepatitis B, either in the acute or chronic stage.

The HBsAg test is one of the earliest markers of hepatitis B infection and plays a crucial role in identifying infected individuals. It is widely used for screening, diagnosis, and monitoring of hepatitis B infection. The test is simple, reliable, and an essential tool in preventing the spread of the virus.

Who should get this test done?

The HBsAg test is recommended for individuals who may be at risk of hepatitis B infection or show related symptoms. You should consider this test if you:

• Experience fatigue, कमजोरी, or loss of appetite
• Have jaundice (yellowing of skin and eyes)
• Experience abdominal discomfort, especially in the liver area
• Have dark urine or pale stools
• Have a history of liver disease
• Have had unprotected sexual contact
• Share needles or have a history of injectable drug use
• Are pregnant (routine screening)
• Have been exposed to infected blood or body fluids

Why consider this test?

The HBsAg test is essential for early detection of hepatitis B infection. Early diagnosis helps prevent complications and limits transmission to others.

This test is used to:

• Detect active hepatitis B infection
• Screen blood donors and pregnant women
• Monitor chronic hepatitis B patients
• Evaluate response to treatment

Early detection through the HBsAg test helps reduce the risk of complications such as Cirrhosis and Liver cancer.

More information

The HBsAg test is a simple blood test that requires a small sample of blood. No special preparation is usually required. Results are generally available quickly.

• Normal result: Negative (no antigen detected)
• Abnormal result: Positive (indicates hepatitis B infection)

If the test is positive, further tests may be required to determine whether the infection is acute or chronic and to assess liver function.

Other names

The HBsAg test is also known by several other names:

• Hepatitis B surface antigen test
• Australia antigen test
• HBV surface antigen test
• Hepatitis B screening test
• HBsAg blood test