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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, such as through unprotected sexual contact, sharing needles, or from mother to child during childbirth. Many people with hepatitis B may not experience symptoms initially, making laboratory testing essential for diagnosis and monitoring. The infection can lead to serious complications including liver cirrhosis and liver cancer if left untreated.

Laboratory testing for hepatitis B involves several different blood tests that detect specific markers of the virus. The hepatitis B surface antigen test, known as HBsAg, is typically the first screening test performed and indicates whether someone is currently infected with the virus. 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 current infection. For those diagnosed with hepatitis B, healthcare providers may also order tests to measure viral load and assess liver function to determine the severity of the infection and guide treatment decisions.

People who should consider hepatitis B testing include pregnant women as part of routine prenatal care, individuals with elevated liver enzymes, people born in regions where hepatitis B is common, healthcare workers exposed to blood, people who inject drugs, and those with multiple sexual partners. Testing is also recommended for individuals living with someone who has hepatitis B, people receiving dialysis, and anyone with HIV infection. Early detection through laboratory testing allows for timely intervention and can prevent transmission to others.

The interpretation of hepatitis B test results requires understanding the combination of markers present. A positive HBsAg result indicates active infection, while a positive surface antibody with negative surface antigen suggests immunity. Chronic hepatitis B is diagnosed when HBsAg remains positive for more than six months. Regular monitoring through laboratory tests is important for people with chronic hepatitis B to assess liver health and determine if antiviral treatment is necessary. Vaccination is highly effective at preventing hepatitis B infection, and post-vaccination testing can confirm that protective antibodies have developed.