ABCD2 Score Risk Classification and Management

Risk Stratification

The ABCD2 score stratifies TIA patients into three risk categories: low risk (0-3 points) with approximately 1-2% stroke risk at 7 days, moderate risk (4-5 points) with approximately 4-8% stroke risk at 7 days, and high risk (6-7 points) with approximately 8-12% stroke risk at 7 days 1, 2
Low Risk (ABCD2 Score 0-3): 7-day stroke risk is 1.0-2.2% 1, 2
Moderate Risk (ABCD2 Score 4-5): 7-day stroke risk is 4.0-8.0% 1, 2
High Risk (ABCD2 Score 6-7): 7-day stroke risk is 8.0-12.5% 1, 2

With specialized care, 7-day stroke risk is only 0.9-2.1% across all ABCD2 categories 3, 4, 5
Urgent assessment and treatment reduces relative stroke risk by approximately 80% 3, 5

For ABCD2 Score ≥4 (High Risk): immediate hospitalization or referral to specialized TIA clinic within 24 hours, urgent CT or MRI brain imaging, and urgent carotid duplex ultrasound if carotid territory symptoms 1, 6
For ABCD2 Score <4 (Low Risk): CT brain and carotid ultrasound within 48-72 hours, can be managed in outpatient rapid-access TIA clinic if available 1, 7

The score assigns points as follows: Age ≥60 years (1 point), Blood pressure ≥140/90 mmHg (1 point), Clinical features (1-2 points), Duration (1-2 points), and Diabetes mellitus (1 point) 1, 2, 6