PCR tests are very accurate when properly performed by a health care professional, but the "rapid test" can miss some cases.

PCR Covid - 19 Test for Airline Travelers

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RT - PCR Covid -19 Test - Results in 24 Hours
 
All appointments scheduled before 12 PM for next day results. 
 
PCR tests are used to directly screen for the presence of viral RNA, which will be detectable in the body before antibodies form or symptoms of the disease are present. This means the tests can tell whether or not someone has the virus very early on in their illness.