Influenza A and B, Direct Immunoassay

CPT: 87804(x2)
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Test Details


  • Flu A and B


Confirm the diagnosis of influenza type A or type B infection. This is a differentiated test and, therefore, will distinguish influenza type A from influenza type B.


Direct immunoassay (IA)

Reference Interval


Specimen Requirements


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


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

Minimum Volume

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


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, nasopharynx). 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; 31(1):142-143. 8417019
Waner JL, Todd, SI, Shalaby H, et al. 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; 29(3):479-482.2037665


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
186064 Influenza A+B Ag, EIA 33535-6 186065 Influenza A Ag, EIA 46082-4
186064 Influenza A+B Ag, EIA 33535-6 186066 Influenza B Ag, EIA 46083-2
186064 Influenza A+B Ag, EIA 33535-6 186067 Comment 77202-0
Reflex Table for Comment
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 186068 Please note: 186068 Please note: N/A

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