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ABCD2 TIA Stroke Risk Score Calculator
x402
ABCD2 TIA Stroke Risk Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Calculates the ABCD2 score (Johnston 2007) to estimate early stroke risk after a transient ischemic attack (TIA), based on age, blood pressure, clinical features, symptom duration, and diabetes.
Price / call$0.005
Success—
StatusUnknown
How this service works
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Output
Returns the numeric ABCD2 total score (0–7) and the corresponding risk band (low: 0–3, moderate: 4–5, high: 6–7), based on the deterministic Johnston 2007 scoring algorithm. Does not include a diagnosis or admission recommendation.
Example use cases
ED triage after TIA presentation
“I have a 72-year-old patient with TIA in the ED — BP is 148/88, they had speech difficulty without weakness lasting 45 minutes, and they have diabetes. What's their ABCD2 score and risk band?”
Urgent neurology referral prioritization
“Help me prioritize my TIA clinic referrals: score a 55-year-old with systolic 130, diastolic 80, no diabetes, unilateral weakness, and symptoms lasting 12 minutes on the ABCD2 scale.”
Automated TIA risk documentation
“For our discharge note, calculate the ABCD2 score for a 61-year-old patient with BP 142/91, no clinical TIA features, symptom duration of 8 minutes, and no diabetes.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/abcd2?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the specific ABCD2 (Johnston 2007) score — not ABCD (Rothwell 2005) or ABCD3-I — for early two-day stroke risk stratification after TIA. Ideal for clinical documentation workflows, automated triage tools, or risk band reporting where a deterministic, peer-cited formula is required and the caller already has all six input values from chart or triage data.
Side effects
- Missing required query parameters returns a validation error
- Diastolic value equal to or exceeding systolic returns an error
- Age outside 18–120 range or duration outside 0–1440 minutes is rejected
- Invalid clinical_features enum string returns an error
- Blood pressure values outside plausible ranges (systolic 50–250, diastolic 20–160) are rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/abcd2",
"count": 2,
"items": [
{
"score": 0,
"formula": "abcd2",
"citation": {
"id": "johnston-2007",
"doi": "10.1016/S0140-6736(07)60150-0",
"title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack",
"source": "Lancet. 2007;369(9558):283-292",
"authors": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al."
},
"age_years": 55,
"max_score": 7,
"abcd2_band": "0-3",
"components": [
{
"value": 55,
"factor": "age",
"points": 0,
"present": false
},
{
"factor": "blood_pressure",
"points": 0,
"present": false,
"systolic_mm_hg": 120,
"diastolic_mm_hg": 80
},
{
"value": "none",
"factor": "clinical_features",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "duration_min",
"points": 0,
"present": false
},
{
"factor": "diabetes",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7"
},
{
"score": 0,
"formula": "abcd2",
"citation": {
"id": "johnston-2007",
"doi": "10.1016/S0140-6736(07)60150-0",
"title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack",
"source": "Lancet. 2007;369(9558):283-292",
"authors": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al."
},
"age_years": 55,
"max_score": 7,
"abcd2_band": "0-3",
"components": [
{
"value": 55,
"factor": "age",
"points": 0,
"present": false
},
{
"factor": "blood_pressure",
"points": 0,
"present": false,
"systolic_mm_hg": 120,
"diastolic_mm_hg": 80
},
{
"value": "none",
"factor": "clinical_features",
"points": 0,
"present": false
},
{
"value": 5,
"factor": "duration_min",
"points": 0,
"present": false
},
{
"factor": "diabetes",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7"
}
]
}
}Tags
x402
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