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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