Experts say there are still times when a PCR test is useful
If you’re feeling fine and simply doing your due diligence before traveling, socializing, or going to an appointment, an at-home test is a great option, says Dr. Charles Chiu, a professor of laboratory medicine at the University of California, San Francisco. If you’re experiencing symptoms and want to know whether they’re caused by COVID-19, rapid tests can also do a good job.
Antigen tests work well if you can do that sort of serial testing, already have symptoms , or want to know about your current contagiousness, such as before an event. But PCR tests are still the best option for situations where “you only have a single opportunity to test and if you missed an infection that was impending, the consequences could be disastrous,” Langelier says. For example, it’s wise to test people before they’re admitted to a hospital or nursing home, where they could spread the virus to lots of vulnerable people if an antigen test missed a brewing illness, he says.
Anyone experiencing severe symptoms or complications of COVID-19 should also get a PCR test, even if they’ve already tested positive on a rapid test, so their doctors can make a concrete diagnosis and decide on treatment plans, Chiu adds. While
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