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How long should I wait after onset of symptoms/exposure before being tested?
If you have been directly exposed to COVID-19 or have developed symptoms, and you desire to be tested, you should ideally wait 5-7 days before getting tested. PCR testing is less reliable when the amount of virus in your nasal passages or throat is small. Getting tested too soon in the course may result in false-negative results. If you are looking into rapid antigen testing, it is best to be tested within the first 5 days of symptoms, but this could vary depending on the test manufacturer and their guidelines.