ISARIC 4C Mortality Score (COVID-19)
ISARIC 4C Mortality Score (Knight 2020): a 0–21 in-hospital COVID-19 mortality score from age, sex, comorbidities, respiratory rate, SpO2, GCS, urea, and CRP.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Age
- 62
- Sex
- Male
- Number of comorbidities
- 2
- Respiratory rate
- 22
- SpO2 on room air
- 95
- Glasgow Coma Scale
- 15
- Urea
- 5
- Urea unit
- Urea mmol/L
- CRP
- 30
Result: ISARIC 4C 8 of 21 -- Intermediate risk group (in-hospital mortality ~9.9%). Contributions: age 62y +4, male +1, >=2 comorbidities +2, RR 22 +1.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-3
- Low; in-hospital mortality ~1.2%.
- 4-8
- Intermediate; ~9.9%.
- 9-14
- High; ~31.4%.
- >=15
- Very high; ~61.5%.
What you enter
- Age (years)
- Sex
- Number of comorbidities
- Respiratory rate (/min)
- SpO2 on room air (%)
- Glasgow Coma Scale
- Urea
- Urea unit
- CRP (mg/L)
How this is calculated
Knight SR, Ho A, Pius R, et al. Risk stratification of patients admitted to hospital with covid-19 using the ISARIC World Health Organization Clinical Characterisation Protocol: development and validation of the 4C Mortality Score. BMJ. 2020;370:m3339. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.