What does the ABCD2 score measure?

It estimates the probability of suffering an ischemic stroke within 2 days of a TIA. A score of 0–3 is low risk (~1%), 4–5 moderate (~4%), and 6–7 high risk (~8%).

Is this tool a substitute for clinical judgment?

No. The ABCD2 score is an educational reference only. Clinical decisions must be made by a qualified healthcare professional using the full clinical picture.

What blood pressure values trigger the point?

One point is awarded if the systolic BP measured at initial assessment is 140 mmHg or greater, OR if the diastolic BP is 90 mmHg or greater.

Why does unilateral weakness score higher than speech disturbance?

Studies show unilateral weakness is a stronger independent predictor of subsequent stroke than isolated speech disturbance, hence it earns 2 points versus 1.

A transient ischemic attack is a brief episode of neurological dysfunction caused by focal brain ischemia, without permanent infarction. It is a major warning sign for imminent stroke.

How accurate is the ABCD2 score?

It has moderate discriminatory ability (AUC ~0.72 in validation studies). It is most useful as a triage aid, not a definitive risk classifier.

ABCD2 TIA Score Calculator

Name: ABCD2 TIA Score Calculator
Availability: InStock
Author: Nham Vu

Enter five clinical parameters to compute the ABCD2 score (0–7) and see the estimated 2-day stroke risk after a TIA.

Summary

Enter five clinical parameters to compute the ABCD2 score (0–7) and see the estimated 2-day stroke risk after a TIA.

How it works

Select the patient's age category (under 60 or 60 and older).
Indicate whether systolic BP was 140 mmHg or higher, or diastolic 90 mmHg or higher.
Choose the most prominent clinical feature: unilateral weakness, speech disturbance without weakness, or other.
Select the duration of TIA symptoms (under 10 minutes, 10–59 minutes, or 60 minutes or longer).
Indicate whether the patient has a history of diabetes.
The score (0–7) and corresponding 2-day stroke risk percentage are displayed instantly.

Use cases

Emergency department triage after a suspected TIA.
Determining urgency of neurology referral or hospital admission.
Educational reference for medical students learning TIA risk stratification.
Quick bedside risk communication with patients and families.
Supporting documentation in clinical case notes.
Comparing risk across multiple patients in a teaching scenario.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu