Test Code HEP Bs AG Hepatitis B Surface Antigen, Serum
Additional Codes
LAB471
Collection Method
Venous collection
Minimum Volume
0.5ml
Container
Gold Top / Serum Separator / Additive Free
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Plasma:
- Light Geen Top (Lithium heparin)
Reference or Target Ranges
Nonreactive
Reportable Units
Reactive/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 intended as a screen only. A reactive result indicates presumptive evidence of infection with HBV. The specimen will be forwarded to Mayo Medical Laboratories for confirmatory testing.
Specimens with reactive screen results but negative (ie, not confirmed) HBsAg confirmatory test results are likely to contain cross-reactive antibodies from other infectious or immunologic disorders. Repeat testing is recommended at a later date if clinically indicated.
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 |
Specimen Stability
Ambient | 6 days |
Refrigerated (4°C to 8°C) | 14 days |
Frozen(-40°C to 0°C) | 6 months |
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