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Streptococcus Group A Antigen

Item Value
Approval req'd? No
Available Stat? Yes
Test code P116
Test group Streptococcus
Performed by Microbiology
In House Availability Samples received before 2100 in the micro processing area at Parnassus (5th floor) we will make every effort to have the results out the same evening.
Method Lateral flow immunassay
Collection Instructions Swab tonsils or tonsilar crypts and posterior pharynx.

Deliver immediately to laboratory. refrigerate if transport is delayed.
Container type Polyester (Dacron) swabs x2 in paper envelope or in clean,dry plastic tube (Do not use charcoal transport media)
Amount to Collect 2 swabs
Sample type Throat swab
Preferred volume 2 swabs
Min. Volume 2 swabs
UCSF Rejection Criteria Swab submitted in charcoal media
Processing notes If antigen test is negative set up a group A strep culture
Normal range Negative
Synonyms Beta-hemolytic Strep; beta-strep
Stability Refrigerated 3 days
Turn around times 1 hour after receipt at China Basin Microbiology
Reflex? Negative samples are automatically reflexed to culture at an additional charge.
Additional information Sensitivity is approximately 70% compared with culture. Culture will be performed automatically on antigen negative samples.

Excess blood or mucus on the swab may interfere with the test performance and may yield a false positive result.

Specimens received in the microbiology laboratory at the Medical Center before 2100 will be tested the same day. Specimens received after 2100 will be tested the following day.
LOINC code 18481-2
Last Updated 10/30/2014 9:45:57 AM
Entry Number 874
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