Influenza A Only, Direct EIA

CPT: 87804
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Test Details


  • Directigen Influenza
  • Influenza A Direct Assay

Test Includes

Enzyme immunoassay for influenza type A.


Confirm the diagnosis of influenza type A infection


Immunoassay (IA)

Reference Interval


Additional Information

Presentation of influenza infection ranges from mild respiratory illness to fatal pneumonia. In addition, secondary bacterial infection can be a serious complication. People at highest risk from infection include the elderly and patients with underlying health problems. Individuals residing in institutional settings, such as nursing homes or college dormitories, may also be at increased risk. This rapid test may be useful in early documentation of influenza A in a community not known to have flu activity during the current season. This can allow for rapid implementation of appropriate control and/or prophylactic measures.

Specimen Requirements


Nasopharyngeal (NP) swab in viral transport medium or NP wash or aspirate


2-3 mL NP wash, 0.5 mL NP aspirate dispersed in at least 2-3 mL transport medium or saline, or swab


Viral, Chlamydia, or Mycoplasma culture transport provided by LabCorp, or other appropriate transport medium; sterile leakproof container

Storage Instructions


Causes for Rejection

Bacterial swab specimen; specimen received in grossly leaking transport container; dry specimen; specimen submitted in fixative or additive; specimen received in expired transport media or incorrect transport device; inappropriate specimen transport conditions; specimen received after prolonged delay in transport (usually more than 72 hours); specimen stored or transported at room temperature; wooden shaft swab in transport device; unlabeled specimen or name discrepancy between specimen and request label

Clinical Information

Special Instructions

Submit one specimen per test requested. Specify the exact specimen source/origin (eg, genital lesion). Indicate a specific test number on the request form. Check expiration date of transport; do not use expired devices.


Johnston SL, Bloy H. Evaluation of rapid enzyme immunoassay for detection of influenza A virus. J Clin Microbiol. 1993 Jan; 31(1):142-143. 8417019
Waner JL, Todd, SJ, Shalaby H, Murphy P, Wall LV. Comparison of Directigen FLU-A with viral isolation and direct immunofluorescence for the rapid detection and identification of influenza A virus. J Clin Microbiol. 1991 Mar; 29(3):479-482. 2037665


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
182295 Influenza A Ag, EIA 46082-4 182295 Influenza A Ag, EIA 46082-4

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