Interactive Modified Centor (McIsaac) Score calculator for strep pharyngitis. Requires the calculator gadget.
Usage: {{Centor Calculator}}
Centor/McIsaac Score
Modified Centor (McIsaac) Score
| Criteria
|
No (0)
|
Yes (+1)
|
| Tonsillar exudates or swelling
|
0
|
1
|
| Tender/swollen anterior cervical lymph nodes
|
0
|
1
|
| Temperature >38°C (100.4°F)
|
0
|
1
|
| Absence of cough
|
0
|
1
|
| Age modifier (McIsaac modification)
|
| Age 3–14 years
|
0
|
1 (+1)
|
| Age 15–44 years
|
(0 points — default)
|
| Age ≥45 years
|
0
|
-1 (−1)
|
| Modified Centor Score
|
0 / 5
|
| Interpretation & Management
|
| ≤0
|
~1–2.5% strep probability — No testing or antibiotics needed.
|
| 1
|
~5–10% strep probability — No testing or antibiotics needed (optional rapid strep if high clinical suspicion).
|
| 2–3
|
~11–35% strep probability — Rapid strep testing recommended; treat if positive.
|
| 4–5
|
~51–53% strep probability — Consider empiric antibiotics or rapid strep test.
|
| References
|
- Centor RM et al. The diagnosis of strep throat in adults. Med Decis Making. 1981;1:239-246. PMID 6763125.
- McIsaac WJ et al. A clinical score to reduce unnecessary antibiotic use. CMAJ. 1998;158:75-83. PMID 9475915.
|
