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  COVID-19 Severity by M-CHA(2)DS(2)-VASc Score

CHF No (0)

Yes (1)
HTN No (0)

Yes (1)
Diabetes No (0)

Yes (1)
Gender Female (0)

Male (1)
CVA No (0)

Yes (2)
VascularDx No (0)

Yes (1)

Important: Inputs must be complete to perform calculation.


Include literature references: Yes   No

  M-CHA(2)DS(2)-VASc Score Interpretation

0 to 1 point: Low risk
2 to 3 points: Intermediate risk
4 to 9 points: High risk


  • 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 Valente study[1], the CHA(2)DS(2)-VASc score is modified by reversing the point values for the Sex coefficient: females are assigned 0 points and males are assigned 1 point.
  • CHF: congestive heart failure; HTN: systemic hypertension; CVA: stroke; VascularDx: vascular disease.

Equations used
Score = AgeFactor + Gender + CHF + HTN + Diabetes + CVA + VascularDx


Calculation Details and Variables
  • Equation parameters such as CHF, 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.
  • AgeFactor is assigned values by this ordered logic:
    • If Age ≥75 yr AgeFactor = 2
    • Else if Age ≥65 yr AgeFactor = 1
    • Else AgeFactor = 0.

  1. Valente Silva B, Placido R, Jorge C, et al. Prognostic Accuracy of the Modified CHA2DS2-VASc Score in COVID-19 Patients Admitted to the Emergency Department Due to Clinical Worsening. Acta Med Port. 2021 Nov 26. PubMed ID: 34837357 PubMed Logo
  2. Olesen JB, Lip GY, Hansen ML, et al. Validation of risk stratification schemes for predicting stroke and thromboembolism in patients with atrial fibrillation: nationwide cohort study. BMJ. 2011 Jan 31;342:d124. doi: 10.1136/bmj.d124. PubMed ID: 21282258 PubMed Logo
  3. Lip GY, Halperin JL. Improving stroke risk stratification in atrial fibrillation. Am J Med. 2010 Jun;123(6):484-8. Review. PubMed ID: 20569748 PubMed Logo

Associated Medical Subject Headings [MeSH]
         Aged,   Atrial Fibrillation,   COVID-19,   Emergency Service,   Female,   Fibrinolytic Agents,   Hospital,   Hospitalization,   Humans,   Incidence,   Kaplan-Meier Estimate,   Male,   Prognosis,   Pulmonary Embolism,   Retrospective Studies,   Risk Assessment,   Risk Factors,   Stroke,   Thromboembolism,   Vitamin K

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      

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.

Associated ICD10-CM Codes
   I67.9Cerebrovascular disease, unspecified
   I48.91Unspecified atrial fibrillation

Associated ICD9-CM Codes
   427.31Atrial fibrillation
   437.9Cerebrovasc disease nos


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