STREP A TEST STRIPS . For a rapid strep test, the throat and tonsils are swabbed to collect bacteria from the infected area for testing. The bacteria are analyzed to see whether Group A Strep (streptococcal) bacteria are causing the sore throat. Results of a rapid strep test are available normally in 10 to 15 minutes. Leading brands include BD, Clarity, OSOM, Pro-Advantage, and Quidel.