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GASNAT, Strep A, Streptococcal A, Streptococcus pyogenes, Group A Strep
This test is useful as a qualitative, diagnostic
test for the detection of Streptococcus pyogenes (Group A Strep, Strep A) acute
pharyngitis infections. Definitive testing results are provided without
the need for follow up culture.
Note: If patient is presenting at MMC-Marshfield Pediatrics department do not order this test. Order Group A Strep by PCR, Point of Care (GASNATP)
If patient is presenting at a regional lab site that continues to perform rapid antigen testing and uses PCR from a central laboratory for confirmation of negative samples please collect two swabs by the following process:
Remove a Puritan polyester swab from the rapid antigen kit and a flocked swab from the ESwab kit. Simultaneously swab the throat with the two swabs. Place the Puritan swab back in the wrapper for RAGT testing. Place the flocked swab into the ESwab tube and break off the shaft at the red score point. If the RADT is negative, refer the ESwab for confirmatory testing by PCR.
To reduce the potential for false negative results, do not collect throat swab specimens immediately after patients have used antiseptic mouthwash
Additionally follow-up testing by culture is required if the Xpert Xpress Strep A test results is negative and clinical symptoms persist, or there is an outbreak of acute rheumatic fever.
'ESwab' is a trademark of Copan Diagnostics.
Negative, or Indeterminate