Influenza A Virus Antibody, IgM
Ordering Recommendation

Do not use to diagnose acute influenza infections. Serological testing for influenza should be used for research and public health investigations only.

Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Mon, Wed, Fri
1-6 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Serum separator tube.  
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.05 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as "acute" or "convalescent."  
Storage/Transport Temperature
Refrigerated. Also acceptable: Room temperature or frozen.  
Unacceptable Conditions
Plasma. Bacterially contaminated, heat-inactivated, hemolyzed, icteric, lipemic, turbid specimens.  
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year  
Reference Interval
0.89 IV or less: Negative - No significant level of influenza A virus IgM antibody detected.
0.90-1.10 IV: Equivocal - Questionable presence of influenza A virus IgM  antibody detected.  Repeat testing in 10-14 days may be helpful. 
1.11 IV or greater: Positive - IgM antibodies to influenza A virus detected, which may suggest current or recent infection.
Interpretive Data

Compliance Statement A: For laboratory developed tests using a manufacturer labeled ASR as the reagent providing the specificity of the assay. Analyte Specific Reagent. This test was developed and its performance characteristics determined by ARUP Laboratories. The U. S. Food and Drug Administration has not approved or cleared this test; however, the FDA has determined that such clearance or approval is not necessary.
CPT Code(s)
Component Test Code*Component Chart NameLOINC
0051081Influenza A Virus Antibody IgM31438-5
* 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 A
  • Flu A IgM