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PCR test. This COVID-19 test detects genetic material of the virus using a lab technique called polymerase chain reaction (PCR). Also called a molecular test, a health care worker collects fluid from a nasal or throat swab or from saliva. Results may be available in minutes if analyzed onsite or a few days — or longer in locations with test processing delays — if sent to an outside lab. PCR tests are very accurate when properly performed by a health care professional, but the rapid test can miss some cases.