Rapid COVID-19 tests available at Sonoma County testing sites By Olivia Wynkoop article FILE - A worker administers a rapid antigen COVID-19 test to a high school student at the Ehrenfried Walther von Tschirnhaus Gymnasium high school on March 16, 2021 in Dresden, Germany. (Photo by Jens Schlueter/Getty Images) Expand SANTA ROSA, Calif. - Rapid antigen testing is now available at Sonoma County COVID-19 testing sites in Santa Rosa, making it possible for residents to know early results in 15 minutes. At county sites, residents will take a BinaxNOW rapid test alongside the standard polymerase chain reaction (PCR) COVID-19 test, which usually takes 48 hours or less to produce the results. The goal is for residents to know their COVID-19 status earlier so they can act accordingly as they wait for their PCR results for confirmation.