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ABCD² score

Estimates stroke risk in the first days after TIA using clinical data available at the first assessment.

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Check the population, units and version. The result shows the formula or classification; it does not make an automatic treatment decision.

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Method · Limits of application

ABCD²/Johnston 2007: age/BP/clinical features/duration/diabetes, total 0–7

A prognostic score after a TIA diagnosis, studied primarily for 2-day stroke risk, with additional analyses at 7 and 90 days. It does not confirm a TIA diagnosis. Probabilities observed in the original cohorts are not a universal individual prediction.

Conditions of use

Check the population, units, inclusion and exclusion criteria, and version in the original source. A result alone does not establish a diagnosis, discharge decision or prescription.

Documented parameters

Age ≥ 60 years
Blood pressure ≥ 140/90 mmHg at initial assessment
Clinical presentation
Symptom duration
Diabetes

3/3 reference cases checked. Numerical tests are not clinical validation.

Sources and documentation

Documented formula

Transcribed from the source or a recorded revision; this is not a clinical recommendation.

Age ≥60: 1 · Blood pressure ≥140/90: 1 · Clinical features: unilateral weakness 2, speech without weakness 1 · Duration: ≥60 min 2, 10 to 59 min 1 · Diabetes 1. Total 0 to 7.

References

Johnston SC et al. Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack. Lancet, 2007.

Identifier: abcd2

Original clinical content: Brazilian Portuguese.

Method version

ABCD²/Johnston 2007: age/BP/clinical features/duration/diabetes, total 0–7

abcd2@native-2026-10-03+e592c93953b6

Source for the active edition

The bibliographic edition identifies the source. By itself, it proves neither full conformity of the formula nor clinical approval.

Synthetic cases checked (3)

Synthetic cases for checking the implementation, with no patient data.

Case 1

reference-001

Inputs

Clinical presentation: Speech disturbance without weakness
Symptom duration: 10 to 59 min
Age ≥ 60 years: No
Blood pressure ≥ 140/90 mmHg at initial assessment: No
Diabetes: No

{
  "clinica": "1",
  "duracao": "1",
  "idade": false,
  "pa": false,
  "dm": false
}

Expected result

{
  "score": 2,
  "level": "low"
}

Actual result

{
  "score": 2
}

Case 2

reference-002

Inputs

Age ≥ 60 years: Yes
Blood pressure ≥ 140/90 mmHg at initial assessment: Yes
Clinical presentation: Unilateral weakness
Symptom duration: < 10 min
Diabetes: No

{
  "idade": true,
  "pa": true,
  "clinica": "2",
  "duracao": "0",
  "dm": false
}

Expected result

{
  "score": 4,
  "level": "mid",
  "verdict": "4,1%"
}

Actual result

{
  "score": 4
}

Case 3

reference-003

Inputs

Age ≥ 60 years: Yes
Blood pressure ≥ 140/90 mmHg at initial assessment: Yes
Clinical presentation: Unilateral weakness
Symptom duration: ≥ 60 min
Diabetes: Yes

{
  "idade": true,
  "pa": true,
  "clinica": "2",
  "duracao": "2",
  "dm": true
}

Expected result

{
  "score": 7,
  "level": "high",
  "verdict": "8,1%"
}

Actual result

{
  "score": 7
}

Code and reproducibility

This tool’s code on GitHub

Download code and tests

Sources, version and reproduction instructions

The code tests are technical checks. Clinical approval and professional translation review are recorded separately.

Relationship with cancer research

General context — relationship to be defined

A resource for general clinical contexts. This edition does not assign a specific oncological relationship; selecting it for a study requires a justified question, population and purpose.