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HelpTest Code HEP Bs AG Hepatitis B Surface Antigen, Serum
Additional Codes
LAB471
Collection Method
Venous collection
Container
Gold Top / Serum Separator / Additive Free
Specimen Type
Preferred
Serum-Gold Top SST or Red Top
Acceptable
Plasma-Light Green Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 6 days |
| Refrigerated (4°C to 8°C) | 14 days |
| Frozen(-40°C to 0°C) | 6 months |
Reference or Target Ranges
Nonreactive
Result Interpretation
Nonreactive: Hepatitis B surface antigen was not detected. This does not exclude the possibility of exposure to, or infection with Hepatitis B Virus.
Reactive: This test is a screening tool only. A reactive result indicates presumptive evidence of HBV infection and will be sent to Mayo Medical Laboratories for confirmatory testing.
If the confirmatory test for HBsAg is negative, the initial reactive result may be due to cross-reactive antibodies from other infections or immune conditions. Repeat testing may be recommended later if clinically appropriate.
Reportable Units
Reactive/Nonreactive
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 2200 mg/dL |
| Icterus Threshold | 40 mg/dL |
| Lipemia Threshold | 2200 mg/dL |
| Other | QNS, contaminated, improperly Labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Routine: 4 hours |
| Stat Availability | No |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
87340
Last review/edit date
2025