Alpha Medical Lab
Hepatitis B Surface Antigen w/ Reflex Confirmation
Ordered Test Code:
HEPBSAG
| Lab Test Component | Requirement |
|---|---|
| Test Name | Hepatitis B Surface Antigen w/ Reflex Confirmation |
| Alpha’s Order Test Code | HEPBSAG |
| Specimen Collection Tube | SST/2mL |
| Collection Tube Handling | Plasma collected in: EDTA (lavender-top) tube |
| Minimum Volume | 1mL |
| Transport Temperture | Refrigerated |
| Stability | Refrigerated: 14 days; Frozen: 30 days |
| Collection Instructions | 2mL serum. 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. |
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.
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