You should do a PCR test for COVID-19 in these situations:
- If you have symptoms of COVID-19, it is recommended to get tested immediately to confirm infection.
- If you have symptoms but your at-home rapid antigen test is negative, follow up with a more sensitive PCR test or repeat the antigen test after 48 hours.
- If you have been exposed to someone with COVID-19 but have no symptoms, wait about 5 days after exposure before testing to avoid inaccurate results.
- If you are in a high-risk group or over 60 years old and develop symptoms, a PCR test is recommended so you can receive medical treatment if needed.
- For accurate detection of the virus, PCR tests are preferred because they amplify the genetic material of the virus and detect even small traces.
PCR tests are usually administered by healthcare providers, and results may take a few days. If you test positive, isolate and follow health guidance to prevent spreading the virus.
In summary, do a PCR test soon after symptoms start or about 5 days after exposure if you are asymptomatic but exposed. If using rapid tests and negative with symptoms, confirm with PCR.
