Estimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Quick COVID-19 Severity Index (qCSI): Clinical Guide
Browse Knowledge HubEstimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Overview
Estimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Clinical Significance
Use only in the population and setting for which qCSI was validated.
When to Use
- Use as decision support when all required inputs are reliable.
How It Is Calculated
- Point score from respiratory rate, oxygen saturation and nasal-cannula flow.
Interpretation
- Use only in the population and setting for which qCSI was validated.
Worked Example
Enter verified values in the displayed units; MedicalC applies the published equation or point system.
Limitations
- Prediction models may be miscalibrated outside their derivation population.
- Measurement and classification error can materially change the result.
Clinical Pearls
- Document source values and units with the result.
- Use trends and the full clinical picture.
Common Mistakes
- Wrong units.
- Using non-contemporaneous inputs.
- Treating the output as a diagnosis or mandatory treatment decision.
Frequently Asked Questions
What does this tool calculate?
Estimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Can the result be used alone?
No. Interpret it with the complete clinical assessment and current guidance.
References
- Haimovich AD et al. Ann Emerg Med. 2020;76:442-453. — Primary or supporting reference for the implemented model.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026
Clinical Disclaimer
MedicalC calculators and clinical tools are intended to support healthcare professionals. They do not replace clinical judgement, individual patient assessment, local guidance or specialist advice.
Results should always be interpreted in the context of the patient’s history, examination, investigations, current clinical condition and applicable professional guidance.