It is recommended to test for COVID-19 at least 5 full days after being exposed if you do not have symptoms. Testing too early after exposure may result in inaccurate negative results. If symptoms develop before the 5-day mark, it is advised to test immediately. If the initial test is negative but symptoms persist, repeat testing after 48 hours is recommended to catch any possible infection. This approach helps maximize test accuracy and prevents silent spread of the virus to others.