Tests are becoming more widely available and are being processed in commercial labs and academic centers across the country. In the US, the most common test for the COVID-19 virus looks for viral RNA in a sample taken with a swab from a person’s nose or throat. Currently, you can expect the test results within three to four days. Likely, the turnaround time for results will be shorter over the next few weeks.
If a test result comes back positive, it is almost certain that the person is infected.
A negative test result is less definite. An infected person could get a so-called ‘false negative’ test result if the swab missed the virus, for example, or because of an inadequacy of the test itself. We also don’t yet know at what point during the course of illness a test becomes positive.
If you experience COVID-like symptoms and get a negative test result, there is no reason to repeat the test unless your symptoms get worse. If your symptoms do worsen, call your doctor or local or state healthcare department for guidance on further testing. You should also self-isolate at home. Wear a mask if you have one when interacting with members of your household. And practise social distancing.