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Test Code GPAAG Rapid Strep Antigen Test LAB885

Important Note

A negative result may be obtained if the specimen is inadequate or antigen concentration is below the sensitivity of the test. It is recommended that all negative Rapid Strep Antigen Test results undergo confirmatory testing.

If a second swab is provided, a confirmation PCR test is performed for all negative results.

Test Method

Immunochromatographic Dipstick Technology; Genzyme OSOM

Specimen Requirement

Throat swab is required. Rayon and Polyester swabs are

Additional Specimen Collection Information

Collection Instructions:

  1. Instruct patient to lie or sit with head tilted back, then open
    mouth, stick out tongue and breathe deeply through mouth during
  2. Direct maximum lighting toward the back of the throat.
  3. Using a tongue blade, depress tongue and vigorously swab the
    tonsillar and posterior pharynx areas that are inflamed, purulent
    or ulcerated using a sterile rayon swab.
  4. Repeat the procedure with a second sterile rayon swab if a 24
    hr culture may also be requested.
  5. Remove swabs without touching any other parts of the mouth and
    return swab to the paper wrapper.
  6. Label the paper wrapper with patient name and two
    identifiers (patient ID number, DOB, etc.) [including source, date
    and time of collection].
  7. Transport the specimen to the laboratory immediately.
  8. The swabs may remain dry and at room temperature for up to 24
    hours prior to testing or culture set up. The swabs may be stored
    for up to 72 hours before tesing, refrigerated at 2-8 C.

Reference Values

Group A Strep Antigen not detected.


Testing is performed Monday through Sunday.

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

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

STAT: Typically completed within 15 minutes after the
specimen arrives at the testing site.

Useful For

Rapid confirmation of a diagnosis of streptococcal

LOINC Code Information

18481-2 Streptococcus pyogenes Ag [Presence] In Throat

CPT Code Information

87880 Dectection Infectious Agent by Immunoassay with
Direct Optical Observation: Streptococcus, group A