Lower Ct values from RT-PCR tests are associated with higher risk of mortality in SARS-CoV2 infections. Ct values < 20 was associated with 2.20 times the hazards of mortality compared to values >30 [(95%CI: 1.28–3.76) adjusted for age, sex, comorbidities and hospitalisation.


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Waudby-West, R., Parcell, B., Palmer, C., Bell, S., Chalmers, J. & Siddiqui, M. 2021, 'The association between SARS-CoV-2 RT-PCR cycle threshold and mortality in a community cohort', European Respiratory Journal, 59, article no: 2100360. https://doi.org/10.1183/13993003.00360-2021

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Last updated: 28 October 2022
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