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Table 1 Overview of CO-RADS categories

From: COVID-19 pneumonia: a pictorial review of CT findings and differential diagnosis

CO-RADS category Level of suspicion for pulmonary involvement of COVID-19 CT findings
0 Uninterpretable Technically insufficient CT scan
1 Very low Normal or non-infectious
2 Low Consistent with other infection rather than COVID-19
3 Indeterminate Unclear whether COVID-19 is present
4 High Suspicious for COVID-19
5 Very high Typical for COVID-19
6 Proven case Positive RT-PCR for COVID-19