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COVID-19 Quick Severity Index (qCSI)

 

Input
 

Respiratory Rate		/min br/min breaths/min
O2 Saturation		% fraction percent rate ratio
Oxygen Flow Rate		L/hr L/min L/sec mL/hr mL/min mL/sec

 
Result
 
Important: Inputs must be complete to perform calculation.

 

qCSI		# count index logit none number points score
Decimal Precision   0 1 2 3

 

qCSI Interpretation

 

0 to 3 points:	4% risk of critical illness
4 to 6 points:	30% risk of critical illness
7 to 9 points:	44% risk of critical illness
10 to 12 points:	57% risk of critical illness

 

 

Data action

 
     
 
Include literature references: Yes   No

 

 

Notes

• 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.

 
Equations used
 

qCSI = RRFactor + O2SatFactor + O2FlowFactor

 

 

Calculation Details and Variables

• RRFactor is assigned values by this ordered logic:
  • If Respiratory Rate >28 breaths/min, RRFactor = 2
  • Else if Respiratory Rate ≥23 breaths/min, RRFactor = 1
  • Else RRFactor = 0.
• O2SatFactor is assigned values by this ordered logic:
  • If O2 Saturation ≤88 %, O2SatFactor = 5
  • Else if O2 Saturation ≤92 %, O2SatFactor = 2
  • Else O2SatFactor = 0.
• O2FlowFactor is assigned values by this ordered logic:
  • If Oxygen Flow Rate ≤2 L/min, O2FlowFactor = 0
  • Else if Oxygen Flow Rate ≤4 L/min, O2FlowFactor = 4
  • Else O2FlowFactor = 5.

 

References

1. 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 Oct;76(4):442-453. PubMed ID: 33012378

 

Associated Medical Subject Headings [MeSH]
 

Adolescent,   Adult,   Aged,   Betacoronavirus,   COVID-19,   COVID-19 Testing,   Clinical Laboratory Techniques,   Coronavirus Infections,   Emergency Service,   Female,   Hospital,   Humans,   Male,   Middle Aged,   Oxygen Inhalation Therapy,   Pandemics,   Pneumonia,   Respiratory Insufficiency,   Retrospective Studies,   Risk Assessment,   SARS-CoV-2,   Severity of Illness Index,   Viral,   Young Adult

 

Associated Logical Observation Identifiers Names and Codes [LOINC]
 

Parameter	LOINC's and Suggested Units
Respiratory Rate	9303-9 : breaths/min      9279-1 : breaths/min      76170-0 : breaths/min      19840-8 : breaths/min
O2 Saturation	2708-6 : %      2713-6 : %      51733-4 : %      59408-5 : %

 
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