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Systolic Blood Pressure  
Serum Creatinine  

Dependency (0.164)

Cardiovascular disease (CVD) (0.316)

Confusion (0.681)

Dyspnea (0.504)
On Dialysis No (0)

Yes (1)
On Oxygen No (0)

Yes (1)
Respiratory Rate  

Criticality Risk  
Decimal Precision  

Include literature references: Yes   No
  • In this calculator, mcg is the abbreviation for micrograms.
  • This calculator represents findings from the literature referenced below. It is important to understand that these findings may not be representative of the experience in your local healthcare system.
  • Dependency: moderate to severe dependency correlating with a Barthel Index <60.
  • Cardiovascular Disease (CVD) includes heart failure, coronary artery disease, cerebrovascular disease, peripheral artery disease, and atrial fibrillation.

Equations used
Factors = (2.663 * (Age/100)2) + (0.844 / (SystolicBloodPressure/100)2) + Dependency + CVD + RenalFactor + Dyspnea + RespiratoryRateFactor + O2Factor + Confusion - 4.665
CriticalityRisk = 100 / (1 + e(-Factors))


Calculation Details and Variables
  • Equation parameters such as On Dialysis, have two or more discrete values that may be used in the calculation. The numbers in the parentheses, e.g. (0), represent the values that will be used.
  • RespiratoryRateFactor is assigned values by this ordered logic:
    • If Respiratory Rate >20 breaths/min RespiratoryRateFactor = 0.911
    • Else RespiratoryRateFactor = 0.
  • RenalFactor is assigned the value of 0.586 when the Serum Creatinine is >3 mg/dL or when the patient is a dialysis recipient. Otherwise, RenalFactor is assigned the value of 0.
  • O2Factor is assigned the value of 1.2 when the SpO2 is ≤93% or when the patient is On Oxygen. Otherwise, O2Factor is assigned the value of 0.

  1. Martínez-Lacalzada M, Viteri-Noel A, Manzano L, et al. Predicting critical illness on initial diagnosis of COVID-19 based on easily obtained clinical variables: development and validation of the PRIORITY model. Clin Microbiol Infect. 2021 Jul 15:S1198-743X(21)00380-3. PubMed ID: 34274525 PubMed Logo

Associated Logical Observation Identifiers Names and Codes [LOINC]
Parameter LOINC's and Suggested Units
Age 21612-7 : yr      21612-7 : yr      21612-7 : years      30525-0 : Years old      30525-0 : yr      30525-0 : years      
SpO2 2708-6 : %      2713-6 : %      51733-4 : %      59408-5 : %      
Systolic Blood Pressure 8480-6 : mmHg      
Serum Creatinine 2160-0 : mg/dL      38483-4 : mg/dL      14682-9 : mcmol/L      22726-4 : mcmol/L      59826-8 : mcmol/L      
Respiratory Rate 9303-9 : breaths/min      9279-1 : breaths/min      76170-0 : breaths/min      19840-8 : breaths/min      

This material contains content from LOINC® (http://loinc.org). The LOINC table, LOINC codes, and LOINC panels and forms file are copyright © 1995-2014, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and available at no cost under the license at http://loinc.org/terms-of-use.

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