{"uid":"cap_Pj68pzyFDlNyiljapKvCm","slug":"hints-examination-interpreter-kattah-2009-d3b90981","name":"HINTS Examination Interpreter (Kattah 2009)","description":"Kattah 2009 three-step HINTS (Head-Impulse, Nystagmus, Test-of-Skew) for patients already in acute vestibular syndrome (AVS). Three caller-assigned flags: head_impulse_normal, direction_changing_nystagmus, and skew_deviation. dangerous is true if any flag is true (INFARCT: Impulse Normal, Fast-phase Alternating, Refixation on Cover Test). benign iff none. Not HINTS-plus (hearing). Not a stroke diagnosis or a substitute for neuroimaging. magent does not examine the patient.","url":"https://api.magentlab.com/api/calc/hints","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":["head_impulse_normal","direction_changing_nystagmus","skew_deviation"],"properties":{"skew_deviation":{"type":"boolean","description":"Skew deviation / vertical ocular misalignment on cover test as assigned by the caller (Kattah 2009). true is a dangerous central sign (INFARCT: Refixation on Cover Test). magent does not examine the patient."},"head_impulse_normal":{"type":"boolean","description":"Normal horizontal head-impulse test (h-HIT) as assigned by the caller (Kattah 2009). true is a dangerous central sign (INFARCT: Impulse Normal). magent does not examine the patient."},"direction_changing_nystagmus":{"type":"boolean","description":"Direction-changing nystagmus in eccentric gaze as assigned by the caller (Kattah 2009). true is a dangerous central sign (INFARCT: Fast-phase Alternating). magent does not examine the patient."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"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_asDlKYUfgXbq-gmP7r89J","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":"Applies the Kattah 2009 three-step HINTS protocol to caller-assigned exam findings to classify acute vestibular syndrome as central (dangerous) or peripheral (benign).","exampleAgentPrompt":"Run the HINTS exam calculation for a patient in acute vestibular syndrome: the head-impulse test is normal (abnormal sign), there is no direction-changing nystagmus, and there is no skew deviation — is the presentation central or peripheral?","exampleUseCases":[{"title":"ED triage for acute dizziness","prompt":"I have a patient in the ER with acute vestibular syndrome. The head-impulse test came back normal, nystagmus is not direction-changing, and there's no skew deviation on cover test. Run the HINTS algorithm and tell me if this is a dangerous central pattern or a benign peripheral one."},{"title":"Bedside teaching HINTS case","prompt":"For a teaching case: the patient has a normal horizontal head-impulse test, direction-changing nystagmus in eccentric gaze, and no skew deviation. What does the Kattah 2009 HINTS protocol say about whether this is a dangerous or benign presentation?"},{"title":"Documenting HINTS findings in a clinical workflow","prompt":"I need to log and interpret HINTS findings for my AVS patient: head impulse is abnormal (so head_impulse_normal is false), nystagmus is not direction-changing, and the cover test shows skew deviation. What is the HINTS classification — dangerous or benign?"}],"resultDescription":"Returns a classification of the acute vestibular syndrome presentation as either dangerous (central, consistent with infarct) if any of the three INFARCT signs are present — normal head-impulse test, direction-changing nystagmus, or skew deviation — or benign (peripheral) if none are present. Does not diagnose stroke and does not substitute for neuroimaging.","failureModes":["Missing required query parameters (head_impulse_normal, direction_changing_nystagmus, or skew_deviation) returns an error","Non-boolean parameter values may cause validation failure","Endpoint classifies based solely on caller-assigned flags; incorrect clinical input yields unreliable output","Not applicable outside the setting of established acute vestibular syndrome (AVS)"],"whenToPreferThis":"Use this endpoint when a clinician or clinical AI agent has already examined a patient in established acute vestibular syndrome (AVS) and has explicit boolean findings for the three HINTS components. Prefer this over general dizziness triage tools when the patient has already been screened into AVS and you need the Kattah 2009 risk stratification specifically. Not a substitute for HINTS-plus (which includes hearing), neuroimaging, or neurological consultation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:01:20.796Z","isFirstParty":false}