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Hepatitis B Surface Antigen Confirmation
MessageOrdered only as reflex to HBSAG - not a standalone order
Part of SQL test code 8020
Part of SQL test code 8020
Test Code
HBSAGCONF
CPT Codes
87340
Instructions
Due to potential assay interference, do not collect samples from patients receiving high dose biotin therapy (i.e. >5 mg/day) until at least 8 hours (optimally 24 to 72 hours) following the last dose.
Clinical Significance
Surface antigen usually appears in the serum after an incubation period of 1 to 6 months following exposure to Hepatitis B virus and peaks shortly after onset of symptoms. It typically disappears within 1 to 3 months. Persistence of Hepatitis B surface antigen for greater than 6 months is a prognostic indicator of chronic Hepatitis B infection.
Note: When only a single test, Hepatitis B Surface Antigen, is ordered to diagnose Hepatitis B in a pregnant woman, additional tests such as liver enzymes should be ordered to confirm the diagnosis.
Note: When only a single test, Hepatitis B Surface Antigen, is ordered to diagnose Hepatitis B in a pregnant woman, additional tests such as liver enzymes should be ordered to confirm the diagnosis.
