What you need to know
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Interpreting the result of a test for covid-19 depends on two things: the accuracy of the test, and the pre-test probability or estimated risk of disease before testing
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A positive RT-PCR test for covid-19 test has more weight than a negative test because of the test’s high specificity but moderate sensitivity
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A single negative covid-19 test should not be used as a rule-out in patients with strongly suggestive symptoms
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Clinicians should share information with patients about the accuracy of covid-19 tests
