🧠 ABCD² Score (Stroke Risk After TIA)
Estimate short-term stroke risk after a transient ischaemic attack with the ABCD² score.
Limited discrimination — do not use to defer assessment.
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When to use
Risk-stratify TIA, though current pathways favour rapid specialist review for all.
How it works
Age ≥ 60 (1), BP ≥ 140/90 (1), clinical features (weakness 2 / speech 1), duration (≥60 min 2 / 10–59 1), diabetes (1). 0–3 low, 4–5 moderate, 6–7 high.
Key points
- Limited discrimination — do not use to defer assessment.
- Most services urgently evaluate and image all TIAs.
- Combine with imaging (carotid, brain) and ECG.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Age ≥ 60 | No |
|---|---|
| BP ≥ 140/90 mmHg | No |
| Clinical features | Unilateral weakness (2) |
| Duration | ≥ 60 min (2) |
| Diabetes | No |
→ABCD²4/7
- 2-day stroke risk：Moderate (~4%)
- Note：Many stroke services now admit/urgently evaluate all TIAs regardless of score.
| Age ≥ 60 | Yes (+1) |
|---|---|
| BP ≥ 140/90 mmHg | Yes (+1) |
| Clinical features | Other (0) |
| Duration | < 10 min (0) |
| Diabetes | Yes (+1) |
→ABCD²3/7
- 2-day stroke risk：Low (~1% 2-day stroke risk)
- Note：Many stroke services now admit/urgently evaluate all TIAs regardless of score.
Frequently asked questions
- What is ABCD² Score (Stroke Risk After TIA)?
- Estimate short-term stroke risk after a transient ischaemic attack with the ABCD² score.
- How is ABCD² Score (Stroke Risk After TIA) calculated? What is the core formula?
- Age ≥ 60 (1), BP ≥ 140/90 (1), clinical features (weakness 2 / speech 1), duration (≥60 min 2 / 10–59 1), diabetes (1). 0–3 low, 4–5 moderate, 6–7 high.
- When is ABCD² Score (Stroke Risk After TIA) used?
- Risk-stratify TIA, though current pathways favour rapid specialist review for all.
- What are the key clinical points for ABCD² Score (Stroke Risk After TIA)?
- Limited discrimination — do not use to defer assessment. Most services urgently evaluate and image all TIAs. Combine with imaging (carotid, brain) and ECG.
- What are the limits and cautions when using ABCD² Score (Stroke Risk After TIA)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is ABCD² Score (Stroke Risk After TIA) calculated in practice? Can you show a worked example?
- Inputs: Age ≥ 60 No, BP ≥ 140/90 mmHg No, Clinical features Unilateral weakness (2), Duration ≥ 60 min (2), Diabetes No → Result: ABCD² 4 /7（2-day stroke risk: Moderate (~4%), Note: Many stroke services now admit/urgently evaluate all TIAs regardless of score.） Inputs: Age ≥ 60 Yes (+1), BP ≥ 140/90 mmHg Yes (+1), Clinical features Other (0), Duration < 10 min (0), Diabetes Yes (+1) → Result: ABCD² 3 /7（2-day stroke risk: Low (~1% 2-day stroke risk), Note: Many stroke services now admit/urgently evaluate all TIAs regardless of score.）