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  COVID-19 CHOD Score for Estimating Risk of Inpatient Pulmonary Embolism

Heart Rate  
D Dimer  

Important: Inputs must be complete to perform calculation.

CHOD Score  

Include literature references: Yes   No

  CHOD Score and Risk of Pulmonary Embolism

0 to 2 points: Low risk (4.5% incidence)
3 to 5 points: Moderate risk (36.8% incidence)
6 to 7 points: High risk (100% incidence)


  • 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.
  • In this study[1] D-dimer was measured by the HemosIL® D-dimer HS500 system.

Equations used
CHODScore = CRPFactor + HRFactor + O2SatFactor + DDimerFactor


Calculation Details and Variables
  • CRPFactor is assigned values by this ordered logic:
    • If CRP ≥50 mg/L CRPFactor = 1
    • Else CRPFactor = 0.
  • HRFactor is assigned values by this ordered logic:
    • If Heart Rate ≥90 beats/min HRFactor = 2
    • Else HRFactor = 0.
  • O2SatFactor is assigned values by this ordered logic:
    • If O2Sat ≤92 % O2SatFactor = 2
    • Else O2SatFactor = 0.
  • DDimerFactor is assigned values by this ordered logic:
    • If D Dimer ≥956 ng(FEU)/mL DDimerFactor = 2
    • Else DDimerFactor = 0.

  1. Garcia-Ortega A, Oscullo G, Calvillo P, et al. Incidence, risk factors, and thrombotic load of pulmonary embolism in patients hospitalized for COVID-19 infection. J Infect. 2021 Feb;82(2):261-269. PubMed ID: 33440207 PubMed Logo
  2. Rindi LV, Al Moghazi S, Donno DR, et al. Predictive scores for the diagnosis of Pulmonary Embolism in COVID-19: A systematic review. Int J Infect Dis. 2021 Nov 27;115:93-100. PubMed ID: 34848375 PubMed Logo

Associated Medical Subject Headings [MeSH]
         Adult,   Aged,   Anticoagulants,   COVID-19,   COVID-19 Testing,   Female,   Fibrin Fibrinogen Degradation Products,   Hospitalization,   Humans,   Incidence,   Male,   Middle Aged,   Pandemics,   Predictive Value of Tests,   Prospective Studies,   Pulmonary Embolism,   Retrospective Studies,   Risk Factors,   SARS-CoV-2,   Spain,   Venous Thromboembolism

Associated Logical Observation Identifiers Names and Codes [LOINC]
Parameter LOINC's and Suggested Units
CRP 1988-5 : mg/L      48421-2 : mg/L      76485-2 : nmol/L      
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      
O2Sat 2708-6 : %      2713-6 : %      51733-4 : %      59408-5 : %      
D Dimer 48065-7 : mcg/mL      71427-9 : mcg/mL      

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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