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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 other body fluids, including through sexual contact, sharing of needles, or from mother to child during childbirth. Many people with hepatitis B do not experience symptoms initially, which is why laboratory testing plays a crucial role in diagnosis and monitoring of the infection.

Laboratory tests for hepatitis B include several specific markers that help determine if a person has an active infection, has recovered from a previous infection, or has immunity due to vaccination. The hepatitis B surface antigen test, known as HBsAg, is the primary screening test used to detect active infection. If this test is positive, it indicates that the person is currently infected with the hepatitis B virus and can potentially transmit it to others. Additional tests include antibodies to the surface antigen, which indicate immunity either from vaccination or recovery from past infection, and antibodies to the core antigen, which appear during and after infection.

For people diagnosed with hepatitis B, doctors use additional laboratory tests to monitor the progression of the disease and assess liver function. These include tests to measure viral load, which indicates how much virus is present in the blood, and liver function tests that evaluate how well the liver is working. The hepatitis B e-antigen test and its corresponding antibody test help determine how active the virus is and whether the infection is likely to respond to treatment. Regular monitoring through these tests helps healthcare providers make informed decisions about treatment and management.

Testing for hepatitis B is recommended for people who are at increased risk of infection, including those born in areas where hepatitis B is common, people with HIV infection, household contacts of infected individuals, healthcare workers, and people who inject drugs. Pregnant women are routinely screened for hepatitis B to prevent transmission to their babies. Early detection through laboratory testing allows for timely intervention and can prevent serious liver complications such as cirrhosis and liver cancer. Vaccination is available and highly effective at preventing hepatitis B infection, and testing can confirm whether a person has developed protective immunity after vaccination.