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4AT Delirium Screening Score Calculator
x402
4AT Delirium Screening 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 2026-09-15).
Computes the Bellelli 2014 4AT score for cognitive impairment and delirium screening from four caller-assigned clinical items
Price / call$0.005
Success—
StatusUnknown
How this service works
4AT (Bellelli 2014): alertness (normal 0, abnormal 4) + AMT4 mistake count 0/1/2 + attention 0/1/2 + acute change or fluctuation (false 0, true 4). Max 12. Band 0 unlikely, 1–3 possible cognitive impairment, ≥4 possible delirium. Not a delirium or dementia diagnosis. magent does not examine the patient. AMT4 is the caller-assigned mistake count only; this API does not collect age, date of birth, place, or year.
Output
Returns the numeric 4AT total score (0–12) along with the corresponding clinical band interpretation: 0 = delirium unlikely, 1–3 = possible cognitive impairment, ≥4 = possible delirium. Does not provide a diagnosis.
Example use cases
ED triage delirium screening
“I need to run the 4AT score on a patient in the ED: alertness is abnormal, they made 2 mistakes on AMT4, attention is untestable so score 2, and there's a documented acute fluctuation — set acute_change to true. What's their 4AT score?”
Post-operative cognitive check
“Can you calculate the 4AT for a post-surgical patient? Alertness is normal, AMT4 shows 1 mistake, they managed fewer than 7 months backwards so attention is 1, and there's no acute change.”
Ward round cognitive screening
“Score this patient on the 4AT: alertness is normal, zero AMT4 mistakes, attention score is 0, and no acute change or fluctuation — what does the 4AT say about delirium likelihood?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/4atWhen to prefer
Use this endpoint when you need to compute the validated Bellelli 2014 4AT rapid clinical test score from pre-assessed clinical observations, and you want a fast, cheap, deterministic arithmetic result with banded interpretation. Prefer this over manual calculation to avoid arithmetic errors. Note this is a screening tool only, not a diagnosis — and the caller must supply all four item scores themselves from their own clinical observations.
Side effects
- Missing required query parameters (alertness, amt4, attention, acute_change) returns a validation error
- Invalid enum values for alertness (not 'normal'/'abnormal') or integer out of range for amt4/attention return bad request
- Payment not included or insufficient USDC triggers x402 payment-required error
- Caller supplying actual patient identifiers (DOB, age) which are not collected and irrelevant to this API
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/4at",
"count": 2,
"items": [
{
"score": 0,
"at_band": "unlikely",
"formula": "4at",
"citation": {
"id": "bellelli-2014",
"doi": "10.1093/ageing/afu021",
"pmid": "24590568",
"title": "Validation of the 4AT, a new instrument for rapid delirium screening: a study in 234 hospitalised older people",
"source": "Age Ageing. 2014;43(4):496-502",
"authors": "Bellelli G, Morandi A, Davis DH, Mazzola P, Turco R, Gentile S, Ryan T, Cash H, Guerini F, Torpilliesi T, Del Santo F, Trabucchi M, Annoni G, MacLullich AM"
},
"max_score": 12,
"components": [
{
"factor": "alertness",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "amt4",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "attention",
"points": 0,
"present": false
},
{
"factor": "acute_change",
"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": "4AT = alertness (normal 0, abnormal 4) + amt4 (0/1/2) + attention (0/1/2) + acute_change (false 0, true 4); Bellelli 2014; max 12; 0 unlikely, 1-3 possible_cognitive_impairment, ≥4 possible_delirium"
},
{
"score": 0,
"at_band": "unlikely",
"formula": "4at",
"citation": {
"id": "bellelli-2014",
"doi": "10.1093/ageing/afu021",
"pmid": "24590568",
"title": "Validation of the 4AT, a new instrument for rapid delirium screening: a study in 234 hospitalised older people",
"source": "Age Ageing. 2014;43(4):496-502",
"authors": "Bellelli G, Morandi A, Davis DH, Mazzola P, Turco R, Gentile S, Ryan T, Cash H, Guerini F, Torpilliesi T, Del Santo F, Trabucchi M, Annoni G, MacLullich AM"
},
"max_score": 12,
"components": [
{
"factor": "alertness",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "amt4",
"points": 0,
"present": false
},
{
"value": 0,
"factor": "attention",
"points": 0,
"present": false
},
{
"factor": "acute_change",
"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": "4AT = alertness (normal 0, abnormal 4) + amt4 (0/1/2) + attention (0/1/2) + acute_change (false 0, true 4); Bellelli 2014; max 12; 0 unlikely, 1-3 possible_cognitive_impairment, ≥4 possible_delirium"
}
]
}
}Tags
x402
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