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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 virus is transmitted through contact with infected blood or body fluids, including through sexual contact, sharing needles, or from mother to child during childbirth. Many people with hepatitis B may not show symptoms initially, making laboratory testing essential for diagnosis and monitoring.

Laboratory tests for hepatitis B include several specific markers that help determine if someone has an active infection, has been exposed to the virus in the past, or has immunity from vaccination. The hepatitis B surface antigen test detects the presence of the virus itself and is usually the first test performed when hepatitis B is suspected. If this test is positive, it indicates an active infection. Additional tests include hepatitis B surface antibody, which shows immunity either from vaccination or recovery from past infection, and hepatitis B core antibody, which indicates past or ongoing infection.

For people diagnosed with hepatitis B, ongoing monitoring through laboratory tests is important to assess liver health and determine if treatment is needed. Liver function tests measure enzymes and proteins in the blood that indicate how well the liver is working. These tests can detect liver inflammation or damage caused by the virus. The hepatitis B viral load test measures the amount of virus in the blood and helps doctors determine disease activity and monitor treatment effectiveness. Regular testing allows healthcare providers to track disease progression and make informed decisions about patient care.

Hepatitis B can be prevented through vaccination, which is highly effective and recommended for infants, healthcare workers, and people at increased risk of exposure. For those already infected, antiviral medications can help control the virus and prevent liver damage. Early detection through laboratory testing is crucial because it allows for timely intervention and reduces the risk of serious complications such as cirrhosis or liver cancer. Anyone at risk for hepatitis B should discuss appropriate screening tests with their healthcare provider.