After exposure to COVID-19, the recommended time to test is to wait at least five full days before taking a test if there are no symptoms. Testing immediately upon symptoms is advised. Testing too early may lead to inaccurate results. If a test is negative but symptoms develop, retesting after 48 hours is recommended. For asymptomatic exposed individuals, if the first test is negative after five days, additional tests spaced 48 hours apart are advised to confirm results.
Key Details on Testing after Exposure
- For asymptomatic individuals, wait at least 5 days after exposure before testing to ensure accuracy.
- Testing immediately if symptoms appear is important; retest after 48 hours if the initial antigen test is negative.
- Multiple tests may be needed after exposure to capture infection missed by early tests.
- The incubation period averages around 5 days but can range from 2 to 17 days, which informs the timing of test sensitivity.
- In high-risk or healthcare settings, immediate testing and follow-up testing at 5–7 days post-exposure are recommended regardless of vaccination status.
Waiting five full days post-exposure maximizes the likelihood that the test will detect the virus if present, reducing the chance of a false-negative result.
