Quick COVID-19 Severity Index (qCSI)
Quick COVID-19 Severity Index (Haimovich 2020): 24-hour risk of respiratory decompensation in admitted COVID-19.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Respiratory rate
- 26 breaths/min
- Pulse oximetry SpO2
- 90 %
- Oxygen flow rate
- 3 L/min
Result: qCSI 7 of 12 — high risk of 24-hour respiratory decompensation (about 44%).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 24h risk
- 0-3 ~4%, 4-6 ~30%, 7-9 ~44%, 10-12 ~57%. A total over 3 is commonly treated as elevated.
What you enter
- Respiratory rate (breaths/min)
- Pulse oximetry SpO2 (%)
- Oxygen flow rate (L/min, 0 = room air)
How this is calculated
- Items
- respiratory rate (<=22=0, 23-28=1, >28=2), SpO2 (>92=0, 89-92=2, <=88=5), O2 flow L/min (<=2=0, 3-4=4, >=5=5) = 0-12.
Haimovich AD, Ravindra NG, Stoytchev S, et al. Development and Validation of the Quick COVID-19 Severity Index: A Prognostic Tool for Early Clinical Decompensation. Ann Emerg Med. 2020;76(4):442-453. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.