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Message: [QUOTE="southofnorth, post: 3808126, member: 9132"] [URL='https://www.cdc.gov/coronavirus/2019-ncov/faq.html']“You may test negative if the sample was collected early in your infection and test positive later during this illness.”[/URL] For the PCR test: “The rate of false negatives — a test that says you don’t have the virus when you actually do have the virus — varies depending on how long infection has been present: in [URL='https://www.acpjournals.org/doi/full/10.7326/M20-1495']one study[/URL], the false-negative rate was 20% when testing was performed five days after symptoms began, but much higher (up to 100%) earlier in infection.” For the Antigen test: “False negative results tend to occur more often with antigen tests than with molecular tests.” That info (and more) can be found [URL='https://www.health.harvard.edu/blog/which-test-is-best-for-covid-19-2020081020734#:~:text=Having%20an%20antibody%20test%20too,negatives%20is%2020%25.']here[/URL]. That said, false positives can still occur. You can read more about why that might occur [URL='https://health.ucdavis.edu/health-news/newsroom/different-types-of-covid-19-tests-explained/2020/11']here[/URL]. [/QUOTE]