Ordering Recommendation

Follow-up test for patients with documented influenza A. Not a first-line test for the detection of suspected influenza in most clinical situations. Detects and subtypes the two predominant strains of circulating influenza A (H1N1 and H3N2).




Qualitative Polymerase Chain Reaction




1-3 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Respiratory specimen: Bronchoalveolar lavage (BAL), nasal wash, nasopharyngeal swab, or pleural fluid.

Specimen Preparation

Fluid: Transfer 1 mL respiratory specimen to a sterile container. (Min: 0.5 mL) Also acceptable: Transfer to viral transport media (ARUP Supply #12884) available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787. Swabs: Place in viral transport media. Place each specimen in an individually sealed bag.

Storage/Transport Temperature


Unacceptable Conditions

Specimen source required.


Ambient: 8 hours; Refrigerated: 5 days; Frozen: 2 months

Reference Interval

Interpretive Data

This test targets the H3 and 2009-H1 hemagglutinin genes. The current circulating Influenza A strains are detected and typed (H1N1 and H3N2), however, other H1 and H3 subtypes may also be detected.

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Hotline History


CPT Codes



Component Test Code* Component Chart Name LOINC
2007470 Influenza A Virus Subtype Source 31208-2
2007471 Influenza A Virus Subtype by PCR 34487-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.


  • Flu H1,H3 PCR
  • Influenza
Influenza A Virus H1/H3 Subtype by PCR (Inactive as of 02/21/23)