# Ottawa COPD Risk Scale Calculator (Stiell 2014) > Ottawa COPD Risk Scale Calculator (Stiell 2014) 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 Ottawa COPD Risk Scale score from ten caller-assigned clinical flags and returns a risk band (low/medium/high/very high) with corresponding SAE percentages. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/ottawa_copd - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/ottawa-copd-risk-scale-calculator-stiell-2014-b67520fa - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g1yfqPSRVzCtTeJSOXur4 Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability ottawa-copd-risk-scale-calculator-stiell-2014-b67520fa ``` Example prompt: Calculate the Ottawa COPD Risk Scale (Stiell 2014) for this patient: no prior CABG, no PVD intervention, no prior intubation, heart rate on arrival was 95 so HR>=110 is false, too ill to walk is true, no ischemic ECG changes, no pulmonary congestion on CXR, hemoglobin is 110 so Hb<100 is false, urea is 14 so urea>=12 is true, and serum CO2 is 32 so CO2>=35 is false — what's the score and risk band? ## When to prefer this Use this endpoint when you need to compute the Ottawa COPD Risk Scale specifically per the Stiell 2014 derivation — not BAP-65, not DECAF, and not the 2018 validation formula. Ideal when all ten clinical flags have already been assessed by a clinician and you need the arithmetic scoring and risk-band lookup done programmatically. ## Known failure modes - Missing required boolean query parameter returns validation error - Non-boolean value passed to a flag field causes schema rejection - Network timeout on rare high-latency calls - Score returned without clinical context may be misapplied if caller-assigned flags are inaccurate (garbage-in) ## How this service works Ottawa COPD Risk Scale (Stiell 2014 derivation). Ten caller-assigned flags: CABG 1, PVD intervention 1, intubation 2, arrival HR >=110 2, too ill to walk or HR >=120 (SaO2 <90%) 2, ischemic ECG 2, CXR congestion 1, Hb <100 g/L 3, urea >=12 1, serum CO2 >=35 1; max 16. Bands low/medium/high/very high with Table 8 SAE percents when published. Not a medical device or admission order; not BAP-65 or DECAF; not the 2018 validation as formula. magent does not walk the patient or read the ECG or CXR. ## Output Returns the numeric Ottawa COPD Risk Score (0–16), the risk band classification (low, medium, high, or very high), and the corresponding Table 8 SAE percentage from the Stiell 2014 derivation study. Does not provide admission orders or device-grade clinical decisions. ## Request schema (JSON Schema) ```json { "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": [ "cabg", "pvd_intervention", "intubation_respiratory", "hr_arrival_ge_110", "too_ill_to_walk", "ischemic_ecg", "pulmonary_congestion", "hemoglobin_lt_100", "urea_ge_12", "serum_co2_ge_35" ], "properties": { "cabg": { "type": "boolean", "description": "Prior coronary artery bypass graft as assigned by the caller (Stiell 2014; 1 point if true). true or false." }, "urea_ge_12": { "type": "boolean", "description": "Urea >=12 mmol/L as assigned by the caller after applying the Stiell 2014 cutoff (1 point if true). true or false. magent does not assay urea." }, "ischemic_ecg": { "type": "boolean", "description": "Acute ischemic changes on ECG as assigned by the caller (Stiell 2014; 2 points if true). true or false. magent does not interpret the ECG." }, "serum_co2_ge_35": { "type": "boolean", "description": "Serum CO2 >=35 mmol/L as assigned by the caller after applying the Stiell 2014 cutoff (1 point if true). true or false. magent does not assay CO2." }, "too_ill_to_walk": { "type": "boolean", "description": "Too ill to do the walk test after ED treatment, or heart rate >=120/min with SaO2 <90%, as assigned by the caller (Stiell 2014; one 2-point item, not two). true or false. magent does not walk the patient." }, "pvd_intervention": { "type": "boolean", "description": "Peripheral vascular disease intervention as assigned by the caller (Stiell 2014; 1 point if true). true or false." }, "hemoglobin_lt_100": { "type": "boolean", "description": "Hemoglobin <100 g/L as assigned by the caller after applying the Stiell 2014 cutoff (3 points if true). true or false. magent does not assay hemoglobin." }, "hr_arrival_ge_110": { "type": "boolean", … (truncated) ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "path": "/api/calc/ottawa_copd", "count": 2, "items": [ { "score": 0, "formula": "ottawa_copd", "citation": { "id": "stiell-2014", "doi": "10.1503/cmaj.130968", "pmid": "24549463", "title": "Clinical characteristics associated with adverse events in patients with exacerbation of chronic obstructive pulmonary disease: a prospective cohort study", "source": "CMAJ. 2014;186(6):E193-E204", "authors": "Stiell IG, Clement CM, Aaron SD, Rowe BH, Perry JJ, Brison RJ, Calder LA, Lang E, Borgundvaag B, Forster AJ, Wells GA" }, "max_score": 16, "components": [ { "factor": "cabg", "points": 0, "present": false }, { "factor": "pvd_intervention", "points": 0, "present": false }, { "factor": "intubation_respiratory", "points": 0, "present": false }, { "factor": "hr_arrival_ge_110", "points": 0, "present": false }, { "factor": "too_ill_to_walk", "points": 0, "present": false }, { "factor": "ischemic_ecg", "points": 0, "present": false }, { "factor": "pulmonary_congestion", "points": 0, "present": false }, { "factor": "hemoglobin_lt_100", "points": 0, "present": false }, { "factor": "urea_ge_12", "points": 0, "present": false }, { "factor": "serum_co2_ge_35", "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.", "sae_percent": 2.2, "ottawa_copd_band": "low", "formula_expression": "ottawa_copd = cabg(1) + pvd_intervention(1) + intubation_respiratory(2) + hr_arrival_ge_110(2) + too_ill_to_walk(2) + ischemic_ecg(2) + pulmonary_congestion(1) + hemoglobin_lt_100(3) + urea_ge_12(1) + serum_co2_ge_35(1); Stiell 2014 derivation Tables 6-8; max 16; SAE 2.2% (score 0) to 91.4% (score 10); score 9 and >10 SAE not published; admission thresholds of total score 1, 2, or 3 had sensitivities 91.2 / 80.9 / 60.3%" }, { "score": 0, "formula": "ottawa_copd", "citation": { "id": "stiell-2014", "doi": "10.1503/cmaj.130968", "pmid": "24549463", "title": "Clinical characteristics associated … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ottawa-copd-risk-scale-calculator-stiell-2014-b67520fa/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)