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15 kwi 2021 · SARS-CoV-2 is the novel coronavirus that causes COVID-19. The spectrum of asymptomatic, presymptomatic, and symptomatic SARS-CoV-2 transmission presents challenges for evaluating...
12 maj 2020 · 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. 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.
SARS-CoV-2 reverse transcriptase–polymerase chain reaction (RT-PCR) testing is highly sensitive (99%) but less specific (approximately 95%) for contagious COVID-19 and may be positive for ≥90 days after infection. Viral antigen tests have lower analytic sensitivity than RT-PCR but are more specific for contagious disease
What do COVID-19 PCR test results mean? A positive test result means that it's likely that you have an infection with SARS-CoV-2. This could be due to asymptomatic infection, but if you have symptoms, then this infection is called COVID-19.
18 sty 2022 · What do results mean for a COVID-19 PCR test? A positive result happens when the SARS-CoV-2 primers match the DNA in the sample and the sequence is amplified, creating millions of copies. This means the sample is from an infected individual.
SARS-CoV-2 indicates severe acute respiratory syndrome coronavirus 2; PCR, polymerase chain reaction. a Detection only occurs if patients are followed up proactively from the time of exposure. b More likely to register a negative than a positive result by PCR of a nasopharyngeal swab.
This guide describes the various diagnostic tests that are available to detect the presence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection resulting in coronavirus disease (COVID-19), or an immune response to this infection, to help clinicians make more informed decisions based on the results of these tests.
