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Epic Test Code LAB471 Hepatitis B Surface Antigen

Important Note

If STAT testing in requested by OB due to patient not receiving prenatal testing please order LAB4715 HEPATITIS B SURFACE ANTIGEN EXPEDITED so that testing can be performed within 12hrs.   If testing is unable to be performed at MIB lab please forward STAT testing to AMC labs.

Synonyms

HHA, HBsAg, Hepatitis Associated Antigen; Hep B Surg Ag

Performing Location(s)

BMC

Specimen Type

Serum

Preferred Container

Gold or Red Top

Blood Tube Draw Volume

Min 50% draw volume  

Minimum Volume to Submit for Testing

2 mL Serum

Transportation Needs

Deliver specimen to laboratory within 1 hour of collection if unspun. If not possible see "storage Requirements". 

Storage Requirements

Primary specimen tubes should be centrifuged within 2 hours of collection followed by transfer of the serum (red or gold top) to a labeled plastic, aliquot tube.

See Causes of Rejection for temperature requirements.

Causes for Rejection

Mislabeled or unlabeled specimen

Plasma

Spun or Unspun sample >6 days at 2-8 °C

Spun or Unspun sample >24 hours at Room Temperature

Hemolysis > 500 mg/dL HgB
Lipemia > 3000 mg/dL Trig
Bilirubin > 20 mg/dL Bili
Total Protein >12 g/dL

EDTA, Heparin, NaF, Citrate, Oxalate

Limitations

  • Patients who are negative for HBsAg may still have acute type B viral hepatitis. There is sometimes a window stage when HBsAg has become negative and the patient has not yet developed the antibody (anti-HBsAg)
  • A negative result does not exclude the possibility of exsposure or infection with hepatitis B virus. A negative result in individuals with prior exposure to hepatitis B may be due to test antigen levels below the detection limit of the assay or lack of specificity. Some assys will not detect all HBV mutants

  • Transient positive HBsAg can occur in patients following HBV vaccination. Positivity from a recent HBV vaccination may persist beyond 14-30 days post-vaccination depending upon the patient’s renal status.

  • Performance of this assy has not been established with cord blood, neonatal speciemens, cadaver specimens or other body fluids
  • Specimens from patient who have received mouse monoclonal antibodies (HAMA) for diagnosis or therapy may exhibit either falsely elevated or depressed levels.
  • Hydrophobic antibodies in human serum may interfere, and additional info may be needed for specimens from patients with Non-Hodgkin’s Lymphoma.

Reference Values

Hepatitis B Surface Antigen Reference Range
Population Units Reference Range
All populations S/CO < 1.00 Negative

Reflex Tests

Presumptive Postive results will automatically Refelx to Hepatitis B Virus Surface Antigen, Confirmation to ARUP. CPT code 87341

Days of Analysis

All

Available STAT

No

Includes

Confirmation of all positives with neutralization confirmatory test

Additional Information

This test is not available on a STAT basis or off-hours, weekends or holidays. If an emergency request is necessary, call 3731 for availability. Pathologist approval may be required.

Certain assys will not detect all HBV mutants. If acute HBV infection is suspected and HBS Ag is negative, it is recommended that other HBV serology markers be tested to confirm HBs Ag nonreactivitiy

 

Hepatitis Testing Guideline/Information

 

 

Methodology

One Step Chemilumimetric Immunoassay

CPT Code

87340

Last Updated

18-Mar-22 BHD