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What is the hepatitis B surface antigen (HBsAg)?

April 26, 2017antigen hbsag

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What is the hepatitis B surface antigen (HBsAg)?

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This tests for the presence of virus. A “positive” or “reactive” HBsAg test result means that the person is infected with the hepatitis B virus, which can be an “acute” or a “chronic” infection. Infected people can pass the virus on to others through their blood and infected bodily fluids.