HBsAg is a protein from the Hepatitis B virus. If it can be detected in your blood, it means you are infected by the virus. HBsAg protein is not detected in an uninfected person. So there is no normal range for HBsAg, it is either positive(reactive) or negative(non-reactive). The number reported in HBsAg test relates to the reagent used in the test, there is no standard and varies from test kit to test kit, you must read the interpretation provided by the laboratory: positive or negative.
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