ABCD² score
Suspected TIA requires timely professional assessment. Never delay urgent assessment because of this score. It cannot diagnose TIA, determine treatment, or establish triage urgency.
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6 fields are required.
ABCD² score
Answer every item and select Calculate.
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Scoring method and interpretation
ABCD² allocation (0–7 points)
Age ≥60: 1 point; systolic BP ≥140 mmHg or diastolic BP ≥90 mmHg: 1 point. Unilateral weakness: 2 points; speech disturbance without weakness: 1; other: 0. Duration ≥60 minutes: 2; 10–59 minutes: 1; under 10 minutes: 0. Diabetes: 1. Do not double-count clinical features.
Historical score groups and observed incidence
Observed strokes within two days in the 2007 study: 1.0% for score groups 0–3; 4.1% for 4–5; 8.1% for 6–7. These are population-level historical observations, not individual probabilities or triage criteria.
Worked example (hypothetical)
Age 66, BP 146/82 mmHg, unilateral weakness, 15-minute symptoms, no diabetes: 1+1+2+1+0=5 points, in the original 4–5 group.
Applicability and limitations
For reference only in suspected TIA, with complete answers. Unknown inputs prevent a reliable score. This tool cannot diagnose TIA or ischemic stroke or determine urgency, and must not delay emergency evaluation.
References and review status
Method: ABCD², Johnston et al. (2007). Source verification: 2026-11-10.