{"uid":"cap_f_0RpW5GfN2Qeo8bFYbQ0","slug":"perry-2021-canadian-tia-score-calculator-0bedca05","name":"Perry 2021 Canadian TIA Score Calculator","description":"Perry 2021 Canadian TIA Score (Table 1) for 7-day stroke or carotid revascularization after TIA. Clinical: first TIA 2, symptoms >=10 min 2, past carotid stenosis 2, antiplatelet 3, gait 1, unilateral weakness 1, vertigo -3, diastolic >=110 3, dysarthria/aphasia 1. Investigations: AF on ECG 2, infarct on CT 1, platelets >=400 2, glucose >=15 mmol/L 3. Age required, 0 points. Total -3 to 23. Bands <=3 low (0.5%), 4-8 medium (2.3%), >=9 high (5.9%). Not ABCD2. Not a diagnosis or admit order.","url":"https://api.magentlab.com/api/calc/canadian_tia","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":["age","first_tia","symptoms_ge_10_min","carotid_stenosis","on_antiplatelet","gait_disturbance","unilateral_weakness","vertigo","diastolic_mm_hg","dysarthria_or_aphasia","af_on_ecg","infarct_on_ct","platelets_10e9_l"],"properties":{"age":{"type":"integer","description":"Age in years (18-120). Required for the adult ED cohort. Does not add points (Perry 2021 Table 1 has no age item)."},"vertigo":{"type":"boolean","description":"Vertigo (Perry 2021 Table 1). true scores -3; false scores 0. magent does not examine the patient."},"af_on_ecg":{"type":"boolean","description":"Atrial fibrillation on ECG (Perry 2021 Table 1). true scores 2; false scores 0. magent does not read the ECG."},"first_tia":{"type":"boolean","description":"Lifetime first TIA (Perry 2021 Table 1). true scores 2; false scores 0. Caller-assigned; magent does not take a history."},"glucose_mg_dl":{"type":"number","description":"Glucose in mg/dL (50-1000). Converted as mmol/L = mg/dL / 18. Provide this or glucose_mmol_l, not both. ≥15 mmol/L after conversion scores 3."},"infarct_on_ct":{"type":"boolean","description":"New or old infarction on CT (Perry 2021 Table 1). true scores 1; false scores 0. magent does not read the CT."},"glucose_mmol_l":{"type":"number","description":"Glucose in mmol/L (2.8-55.5). Provide this or glucose_mg_dl, not both. ≥15.0 scores 3; 14.9 scores 0 (Perry 2021 Table 1)."},"diastolic_mm_hg":{"type":"number","description":"Initial triage diastolic blood pressure in mm Hg (20-160). ≥110 scores 3; 109 scores 0 (Perry 2021 Table 1)."},"on_antiplatelet":{"type":"boolean","description":"Already on antiplatelet therapy (Perry 2021 Table 1). true scores 3; false scores 0."},"carotid_stenosis":{"type":"boolean","description":"Past history of carotid stenosis (Perry 2021 Table 1). true scores 2; false scores 0. magent does not read imaging."},"gait_disturbance":{"type":"boolean","description":"Gait disturbance (Perry 2021 Table 1). true scores 1; false scores 0. magent does not examine the patient."},"platelets_10e9_l":{"type":"number","description":"Platelet count ×10^9/L (1-2000). ≥400 scores 2; 399 scores 0 (Perry 2021 Table 1)."},"symptoms_ge_10_min":{"type":"boolean","description":"Symptoms lasting 10 minutes or longer (Perry 2021 Table 1). true scores 2; false scores 0. magent does not time the episode."},"unilateral_weakness":{"type":"boolean","description":"Unilateral weakness (Perry 2021 Table 1). true scores 1; false scores 0. magent does not examine the patient."},"dysarthria_or_aphasia":{"type":"boolean","description":"Dysarthria or aphasia on history or examination (Perry 2021 Table 1). true scores 1; false scores 0. Not 3. 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_JHQa1UaDtGKwfq5hHixA-","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":"Calculates the Perry 2021 Canadian TIA score (Table 1) to stratify 7-day risk of stroke or carotid revascularization after a transient ischemic attack","exampleAgentPrompt":"Calculate the Perry 2021 Canadian TIA score for a 72-year-old patient: this is their first TIA, symptoms lasted over 10 minutes, they have known carotid stenosis, they are already on antiplatelet therapy, they have gait disturbance, no unilateral weakness, no vertigo, diastolic BP is 115 mmHg, no dysarthria, AF seen on ECG, new infarct on CT, platelets are 390, and glucose is 16 mmol/L.","exampleUseCases":[{"title":"ED triage after first TIA event","prompt":"Score this patient who just had their first TIA: 68 years old, symptoms lasted 12 minutes, known carotid stenosis, not on antiplatelet, no gait issues, unilateral weakness present, no vertigo, diastolic BP 108, no dysarthria, no AF on ECG, no CT infarct, platelets 410, glucose 10 mmol/L — what is their Canadian TIA score and risk band?"},{"title":"High-risk TIA patient identification","prompt":"I need the Perry 2021 Canadian TIA score for a 80-year-old: first TIA yes, symptoms ≥10 min yes, carotid stenosis yes, on antiplatelet yes, gait disturbance yes, unilateral weakness yes, vertigo no, diastolic 115 mmHg, dysarthria yes, AF on ECG yes, infarct on CT yes, platelets 420, glucose 16.5 mmol/L — is this patient high risk?"},{"title":"Low-risk TIA discharge decision support","prompt":"Can you run the Canadian TIA score for a 55-year-old whose first TIA symptoms lasted 8 minutes, no carotid stenosis, not on antiplatelet, no gait disturbance, no unilateral weakness, vertigo present, diastolic 95 mmHg, no dysarthria or aphasia, no AF on ECG, no infarct on CT, platelets 300, glucose 6 mmol/L?"}],"resultDescription":"Returns the total Perry 2021 Canadian TIA score (range -3 to 23), individual item scores, and a risk band classification: low (≤3, ~0.5% 7-day risk), medium (4–8, ~2.3%), or high (≥9, ~5.9%) for stroke or carotid revascularization","failureModes":["Missing required query parameters returns a validation error","Both glucose_mmol_l and glucose_mg_dl provided simultaneously returns an error","Age outside 18–120 range returns a validation error","Diastolic BP outside 20–160 mmHg returns a validation error","Platelet count outside valid range returns a validation error","Glucose outside valid range (2.8–55.5 mmol/L or 50–1000 mg/dL) returns a validation error"],"whenToPreferThis":"Use this endpoint when you need to apply the Perry 2021 Canadian TIA score specifically (Table 1 version), which differs from the older ABCD2 score. Prefer this over ABCD2-based tools when you have ECG, CT, and lab results available (AF, infarct, platelets, glucose), as the Canadian TIA score incorporates investigation findings for superior risk stratification in an adult emergency department context.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:50:53.229Z","isFirstParty":false}