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HelpTest Code HEP Bs AG Hepatitis B Surface Antigen, Serum
Additional Codes
LAB471
Performing Laboratory
Central Peninsula Hospital
Collection Method
Venipuncture
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
Negative
Result Interpretation
Negative: 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. (Hepatitis B DNA Quantitative, RT-PCR)
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/Negative
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 |
Stat: 1 hour |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
Hepatitis B Surface Antigen, Serum - 87340
Hepatitis B DNA Quantitative, RT-PCR - 87517
Last review/edit date
2025