This calculator helps predict the likelihood of bacterial pharyngitis (strep throat) based on clinical signs. The Centor score, also known as the McIsaac score, is a clinical decision rule used to determine the need for throat swab testing or antibiotic treatment.
Start with your values, or try a preset.
Enter Tonsillar Exudates (pus on tonsils), Tender Anterior Cervical Nodes (swollen/tender lymph nodes in the neck), Cough, History of Fever (over 100.4 °F / 38°C), and Age (years) in the units shown.
Read Centor Score and Likelihood of Strep Throat in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Tonsillar Exudates (pus on tonsils): Yes; Tender Anterior Cervical Nodes (swollen/tender lymph nodes in the neck): Yes; Cough: No; History of Fever (over 100.4 °F / 38°C): Yes; Age (years): 25
Centor Score: 4; Likelihood of Strep Throat: Very High (50-80%)
Tonsillar Exudates (pus on tonsils): No; Tender Anterior Cervical Nodes (swollen/tender lymph nodes in the neck): No; Cough: Yes; History of Fever (over 100.4 °F / 38°C): No; Age (years): 40
Centor Score: 0; Likelihood of Strep Throat: Very Low (1-2%)
Tonsillar Exudates (pus on tonsils): Yes; Tender Anterior Cervical Nodes (swollen/tender lymph nodes in the neck): No; Cough: No; History of Fever (over 100.4 °F / 38°C): Yes; Age (years): 10
Centor Score: 4; Likelihood of Strep Throat: Very High (50-80%)
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