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  COVID-19 Severity by Shock Index and Modified Shock Index

Heart Rate  
Systolic BP  
Diastolic BP  

Important: Inputs must be complete to perform calculation.

Shock Index  
mShock Index  
Decimal Precision  

Include literature references: Yes   No

  • 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.
  • In the Kurt article[1] the Shock Index cutoff for hospital mortality was 0.72 with sensitivity of 71.2%, specificity of 69.6%, and ROC-AUC of 0.719. The mShock Index cutoff for hospital mortality was 1 with sensitivity of 74%, specificity of 72.4%, and a slightly better ROC-AUC of 0.739.
  • BP: blood pressure; MAP: mean arterial pressure.

Equations used
MAP = ((2 * Diastolic BP) + Systolic BP) / 3
Shock Index = Heart Rate / Systolic BP
mShock Index = Heart Rate / MAP


  1. Kurt E, Bahadirli S. The Usefulness of Shock Index and Modified Shock Index in Predicting the Outcome of COVID-19 Patients. Disaster Med Public Health Prep. 2021 Jun 8:1-6. PubMed ID: 34099089 PubMed Logo
  2. Liu YC, Liu JH, Fang ZA, et al. Modified shock index and mortality rate of emergency patients. World J Emerg Med. 2012;3(2):114-7. PubMed ID: 25215048 PubMed Logo
  3. Ak R, Doganay F. Comparison of four different threshold values of shock index in predicting mortality of COVID-19 patients. Disaster Med Public Health Prep. 2021 Dec 23:1-15. PubMed ID: 34937595 PubMed Logo

Associated Medical Subject Headings [MeSH]
         Adult,   COVID-19,   Emergency Service,   Female,   Heart Rate,   Hospital,   Hospital Mortality,   Humans,   Hypertension,   Intensive Care Units,   Male,   Middle Aged,   ROC Curve,   Retrospective Studies,   Severity of Illness Index,   Shock,   Triage

Associated Logical Observation Identifiers Names and Codes [LOINC]
Parameter LOINC's and Suggested Units
Heart Rate 8867-4 : beats/min      8893-0 : beats/min      8890-6 : beats/min      8889-8 : beats/min      68999-2 : beats/min      76282-3 : beats/min      69000-8 : beats/min      69001-6 : beats/min      
Systolic BP 8480-6 : mmHg      
Diastolic BP 8462-4 : mmHg      
MAP 8478-0 : mmHg      8458-2 : mmHg      76214-6 : mmHg      75996-9 : mmHg      76536-2 : mmHg      
Shock Index 98909-5 : score      
mShock Index 98910-3 : score      

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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