Hepatitis B Surface Antigen (HBsAg), also known as Australia antigen is present on the surface of the Hepatitis B virus (HBV). This test detects the presence of Hepatitis B Surface Antigen (HBsAg) in the blood.
Why is HBsAg done?
- To detect Hepatitis B virus infection in patients having symptoms suggestive of Hepatitis
- To screen for Hepatitis B infection following accidental exposure to HBV e.g. in healthcare workers. Repeat testing is recommended after 6 weeks post exposure
- To screen for Hepatitis B infection in individuals who are at risk of acquiring infection like IV drug users, sex workers, hemodialysis patients, prisoners, etc.
- To screen for Hepatitis B infection during pregnancy to prevent transmission of infection from mother to child
A "Reactive" or "Positive" HBsAg test result means that the person is infected with Hepatitis B virus. If a person tests “positive,” then further testing is required to determine if this is a new “acute” infection or a “chronic” Hepatitis B infection or chronic HBV carrier state.
A "Non-reactive" or "Negative" HBsAg test result means that the person is not infected with Hepatitis B virus.
No Special Preparation Required.
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