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Test Code INFMOL Influenza A, B PCR LAB4192

Important Note

Potentially interfering substances that may be present in the nasopharynx may include, but are not limited to: blood, nasal secretions or mucus, and nasal and throat medications used to relieve congestion, nasal dryness, irritation, or asthma and allergy symptoms, as well as antibiotics and antivirals.

Recent exposure to FluMist or other live attenuated influenza vaccines may cause inaccurate positive results.

Test Method

Real Time Polymerase Chain Reaction (rtPCR)


Testing is performed Monday through Sunday.

Routine orders: Typically completed within 4 hours after
specimen arrives at the testing site.

Expedite: Typically completed within 2 hours after specimen
arrives at the testing site.

STAT: Typically completed within 1 hour after specimen
arrives at the testing site.


Useful For

Aiding in the diagnosis of influenza

Specimen Requirement

Xpert Nasopharyngeal Sample Collection Kit for Viruses (Cepheid


CPT Code Information

87502 Detection Infectious Agent by Probe Techniques: Influenza
virus, for multiple types or sub-types, multiplex reverse
transcription and amplified probe technique, first 2 types or

Reference Values

Influenza A: Negative

Influenza B: Negative


LOINC Code Information

48509-4 Influenza virus A+B RNA [Identifier] In Unspecified
Specimen By Probe And Target Amplification Method

Additional Specimen Collection Information

The specimen should be collected as soon as possible after the
clinical onset of disease. Highest viral titers are present during
the acute illness. Nasal collection kit supplies are distributed by
the hospital laboratory sites. Specimens in UTM tubes can be
stored for up to 72 hours stored at 2-8°c. If there is a delay
in testing, freeze the



Nasal pharyngeal swab specimen:

  1. Collect the specimen using the Copan Floq Swab in the
    collection kit.
  2. Each swab has a label indicating “Flu PCR Nasal
    Pharyngeal Swab”.
  3. Transport the specimen to the lab as soon as possible.
  4. If there is a delay longer than 15 minutes in transporting the
    specimen to the lab, refrigerate the specimen and then transport on
    a cold pack or wet ice within one hour of collection.
  5. Remove the cap from the UTM tube.
  6. Insert swab into the utm tube.
  7. Break the swab shaft by bending it against the tube wall.
  8. Replace cap and close tightly.
  9. Label the specimen appropriately with two identifiers (patient
    ID number, DOB, etc.) include specimen source, date and
    time of collection.


Clients unable to transport nasal
pharyngeal swab specimens to the laboratory within one hour of
collection are supplied with the entire nasal collection kit.

  1. Collect nasal pharyngeal specimen.
  2. Remove cap from the UTM and insert the swab.
  3. Break the swab shaft by bending it against the tube wall.
  4. Replace the cap and close the tube tightly.
  5. Label the specimen appropriately with two identifiers, patient
    name and another identifier, (patient ID number, DOB, etc.) include
    date and time of collection and initals of person collecting the
  6. Transport the tube on a cold pack to United Clinical
    Laboratories as soon as possible.