{"uid":"cap_pXQo_XTojCZ8LJ0QfT29_","slug":"4at-delirium-screening-score-calculator-3bcc6657","name":"4AT Delirium Screening Score Calculator","description":"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.","url":"https://api.magentlab.com/api/calc/4at","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["alertness","amt4","attention","acute_change"],"properties":{"amt4":{"enum":[0,1,2],"type":"integer","description":"Caller-assigned AMT4 mistake count only (Bellelli 2014): 0 mistakes → 0; 1 mistake → 1; ≥2 mistakes or untestable → 2. Integer 0, 1, or 2. This API does not collect age, date of birth, place, or year."},"alertness":{"enum":["normal","abnormal"],"type":"string","description":"Bellelli 2014 4AT item 1 as assigned by the caller. normal scores 0; abnormal scores 4. magent does not observe consciousness."},"attention":{"enum":[0,1,2],"type":"integer","description":"Bellelli 2014 months-backwards item as assigned by the caller. 0: achieves ≥7 months. 1: starts but <7 months or refuses. 2: untestable. Integer 0, 1, or 2. magent does not run months backwards."},"acute_change":{"type":"boolean","description":"Bellelli 2014 acute change or fluctuating course as assigned by the caller. true scores 4. magent does not take a collateral history."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"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"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_C482dd3rbK7UAZjWY9qBv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the Bellelli 2014 4AT score for cognitive impairment and delirium screening from four caller-assigned clinical items","exampleAgentPrompt":"Calculate the 4AT delirium score for a patient whose alertness is normal, AMT4 mistake count is 1, attention score is 2 (untestable), and there is an acute change in mental status — so acute_change is true.","exampleUseCases":[{"title":"ED triage delirium screening","prompt":"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?"},{"title":"Post-operative cognitive check","prompt":"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."},{"title":"Ward round cognitive screening","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:10:11.365Z","isFirstParty":false}