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Hepatitis B is a viral infection that affects the liver and can cause both acute and chronic disease. The hepatitis B surface antigen (HBsAg) test is one of the most important laboratory tests used to detect this infection. This test looks for a specific protein found on the surface of the hepatitis B virus in your blood. When HBsAg is present in your blood, it indicates that you are currently infected with the hepatitis B virus, whether the infection is recent or long-standing.

Healthcare providers typically order the HBsAg test for several reasons. It may be used as a screening test for people at higher risk of hepatitis B infection, including those who live with or have close contact with infected individuals, healthcare workers, people receiving dialysis, pregnant women, and individuals born in regions where hepatitis B is common. The test is also performed when someone shows symptoms of liver disease such as jaundice, dark urine, fatigue, or abdominal pain. Additionally, it serves as a monitoring tool for people already diagnosed with hepatitis B to track the status of their infection.

The HBsAg test requires a simple blood sample, usually drawn from a vein in your arm. No special preparation is needed before the test. Results are typically reported as either positive or negative. A positive result means that HBsAg was detected in your blood, indicating current hepatitis B infection. However, a single positive test cannot distinguish between acute and chronic infection, so additional testing may be needed. A negative result generally means you do not have hepatitis B infection, though in very early infection the test might not yet detect the antigen.

If your HBsAg test comes back positive, your healthcare provider will likely order additional tests to determine whether you have an acute or chronic infection and to assess your liver function. These may include tests for hepatitis B antibodies, viral load measurements, and liver enzyme tests. It is important to follow up with your healthcare provider to discuss your results, understand what they mean for your health, and determine if treatment or monitoring is necessary. People with chronic hepatitis B infection need regular medical supervision to prevent complications such as liver damage, cirrhosis, or liver cancer.