ED Decision Tools

Modified Centor Score for Strep Pharyngitis

Estimates the probability of Group A Strep in acute pharyngitis (McIsaac age-adjusted) — guiding who to test and who to leave alone.

Low risk

Score 1 · ~5–10% GAS risk
No testing or antibiotics — test only if clinically concerned

1pts

Age

Tonsillar exudate or swelling

Tender anterior cervical lymphadenopathy

Fever (>38°C / 100.4°F)

Absence of cough