EXPERIENCE AND REASON |



* Pediatric Associates of Charlottesville
Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia
In the office laboratory of our private practice, the sensitivity of a single rapid antigen detection (RAD) test for group A streptococci (compared with backup throat culture) was examined over 3 winter periods. When cultures were held only 24 hours, the sensitivity was 92%; in the second period, when cultures were held to 48 hours, the sensitivity declined significantly to 86%; when the cultures were read without knowledge of the RAD test result, the sensitivity was 85%. As the Red Book Committee has suggested, physician office laboratories should validate the sensitivity of their RAD test against culture onto blood agar before abandoning the backup throat culture.
Key Words: group A ß-hemolytic streptococci rapid antigen detection test
Abbreviations: GABHS, group A ß-hemolytic streptococci/streptococcal RAD, rapid antigen detection IDSA, Infectious Disease Society of America OIA, optical immunoassay
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