Hepatitis B surface antigen (HBsAg)
Hepatitis B surface antigen (HBsAg) is a protein on the surface of the Hepatitis B virus. Its presence in the blood indicates an active infection and that the virus is replicating. Testing for HBsAg is important for diagnosing Hepatitis B, a liver infection that can lead to serious health issues. If someone tests positive for HBsAg, they may require monitoring and treatment. People can also develop immunity to the virus, which is detected when HBsAg is not present, but specific antibodies are found instead, usually after vaccination or recovery from the infection.
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Hepatitis B surface antigen (HBsAg) is a protein found on the surface of the hepatitis B virus. Its presence in the blood indicates an active infection with the virus, which can affect the liver and potentially lead to serious health issues. HBsAg is often tested during routine blood screenings or when someone shows symptoms of liver disease. A positive result means the person is currently infected and may spread the virus, while a negative result suggests they are not infected. Monitoring HBsAg levels helps healthcare providers assess the infection and determine the best course of action.