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Hepatitis B is a serious liver infection caused by the hepatitis B virus. This viral infection can range from a mild illness lasting a few weeks to a severe, lifelong condition. When someone is first infected with hepatitis B, it is called acute hepatitis B. If the infection persists for more than six months, it becomes chronic hepatitis B, which can lead to serious health problems including liver damage, cirrhosis, liver cancer, and even liver failure.

Laboratory testing plays a crucial role in diagnosing and monitoring hepatitis B infection. The most common initial screening test is the hepatitis B surface antigen test, which detects a protein on the surface of the virus. If this test is positive, it indicates an active hepatitis B infection. Additional blood tests can determine whether the infection is acute or chronic, and whether a person has immunity from previous infection or vaccination. These tests include hepatitis B surface antibody, hepatitis B core antibody, and hepatitis B e-antigen tests. Healthcare providers may also order liver function tests to assess how well the liver is working and whether there is any liver damage.

For people diagnosed with chronic hepatitis B, regular monitoring through laboratory tests is essential. Doctors typically order tests to measure viral load, which shows how much virus is present in the blood. This helps determine if treatment is needed and how well treatment is working. Liver function tests and tests for liver fibrosis may also be performed periodically to monitor liver health. Alpha-fetoprotein testing and imaging studies may be recommended to screen for liver cancer in people with chronic hepatitis B.

Prevention of hepatitis B is possible through vaccination, which is highly effective and recommended for all infants, unvaccinated children and adolescents, and adults at increased risk of infection. Laboratory testing after vaccination can confirm that a person has developed protective antibodies. Anyone who thinks they may have been exposed to hepatitis B should consult their healthcare provider about testing, as early detection and appropriate management can prevent serious complications and reduce the risk of transmission to others.