Variation in False-Negative Rate of Reverse Transcriptase Polymerase Chain Reaction–Based SARS-CoV-2 Tests by Time Since ExposureFREE

Review of 7 studies (n=1330 samples) advises caution in interpreting results, particularly early in infection (over 4 days of infection before typical time of symptom onset [day 5], probability of false-negative in infected person decreases from 100% on day 1 to 67% on day 4).


Annals of Internal Medicine