# HEART score HEART score ## Also searched as - HEART score - HEART chest pain score - History ECG Age Risk Troponin - Six HEART score - emergency room HEART score - chest pain HEART - HEART score Six 2008 Status: LIVE Price: $0.005 USDC `GET /api/calc/heart` HTML: https://magentlab.com/docs/heart Markdown: https://magentlab.com/docs/heart.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Compute the HEART score as age points plus caller-assigned history, ECG, risk factors, and troponin (each 0-2). ## When to use When an agent needs the published Six 2008 HEART total and must not invent history, ECG, risk-factor, or troponin points from a tracing or assay. ## When not to use - Not a diagnosis or discharge protocol. - history, ecg, risk_factors, and troponin are caller-assigned integers 0-2. magent does not interpret the history, count risk factors, or read an ECG. - This is the HEART score (Six 2008), not HEART Pathway. Troponin uses Six 2008 bands (≤ULN / 1-2× ULN / >2× ULN). ## Formula ``` HEART = history + ECG + age + risk_factors + troponin; each 0-2; age <45 0, 45-64 1, >=65 2; bands 0-3 / 4-6 / 7-10; max 10 ``` ## Citation [Chest pain in the emergency room: value of the HEART score](https://doi.org/10.1007/BF03086144) Six AJ, Backus BE, Kelder JC Neth Heart J. 2008;16(6):191-196 DOI: [10.1007/BF03086144](https://doi.org/10.1007/BF03086144) ## Worked example ### Age 40, all components 0 Given: `age=40, ecg=0, history=0, risk_factors=0, troponin=0` 1. Age 40 (<45) → 0; history 0; ECG 0; risk_factors 0; troponin 0 2. Score = 0; band 0-3 ## Parameters - `age` (integer, required): Age in years (18-120). Younger than 45 scores 0; 45-64 scores 1; 65 or older scores 2. - `history` (integer, required): Caller-assigned history. 0 nonspecific, 1 moderately suspicious, 2 highly suspicious. magent does not interpret the history. - `ecg` (integer, required): Caller-assigned ECG. 0 normal; 1 repolarization without significant ST depression (including BBB, LVH, digoxin, or known unchanged); 2 significant ST depression or elevation without those confounders. magent does not read an ECG. - `risk_factors` (integer, required): Caller-assigned risk-factor points. 0 none, 1 = 1-2 risk factors, 2 = ≥3 or atherosclerotic disease. magent does not count diabetes, smoking, or other factors. - `troponin` (integer, required): Caller-assigned troponin. 0 ≤ULN, 1 = 1-2× ULN, 2 = >2× ULN (Six 2008). magent does not interpret assays. ## Bulk (POST) POST the same path with a JSON items array. Price is n times the GET unit. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/heart` Max items: 25 Price: unit_amount * n (unit 5000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "age": "40", "ecg": "0", "history": "0", "risk_factors": "0", "troponin": "0" }, { "age": "40", "ecg": "0", "history": "0", "risk_factors": "0", "troponin": "0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/heart Example 200: ```json { "count": 2, "path": "/api/calc/heart", "items": [ { "components": [ { "value": 0, "factor": "history", "points": 0, "present": false }, { "value": 0, "factor": "ecg", "points": 0, "present": false }, { "value": 40, "factor": "age", "points": 0, "present": false }, { "value": 0, "factor": "risk_factors", "points": 0, "present": false }, { "value": 0, "factor": "troponin", "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.", "citation": { "authors": "Six AJ, Backus BE, Kelder JC", "doi": "10.1007/BF03086144", "id": "six-2008", "source": "Neth Heart J. 2008;16(6):191-196", "title": "Chest pain in the emergency room: value of the HEART score" }, "formula": "heart", "formula_expression": "HEART = history + ECG + age + risk_factors + troponin; each 0-2; age <45 0, 45-64 1, >=65 2; bands 0-3 / 4-6 / 7-10; max 10", "max_score": 10, "score": 0, "age_years": 40, "heart_band": "0-3" }, { "components": [ { "value": 0, "factor": "history", "points": 0, "present": false }, { "value": 0, "factor": "ecg", "points": 0, "present": false }, { "value": 40, "factor": "age", "points": 0, "present": false }, { "value": 0, "factor": "risk_factors", "points": 0, "present": false }, { "value": 0, "factor": "troponin", "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.", "citation": { "authors": "Six AJ, Backus BE, Kelder JC", "doi": "10.1007/BF03086144", "id": "six-2008", "source": "Neth Heart J. 2008;16(6):191-196", "title": "Chest pain in the emergency room: value of the HEART score" }, "formula": "heart", "formula_expression": "HEART = history + ECG + age + risk_factors + troponin; each 0-2; age <45 0, 45-64 1, >=65 2; bands 0-3 / 4-6 / 7-10; max 10", "max_score": 10, "score": 0, "age_years": 40, "heart_band": "0-3" } ] } ``` ## Response fields - `formula` (string): heart - `formula_expression` (string): Exact expression used - `score` (integer): Total points 0-10 - `max_score` (integer): Always 10 - `heart_band` (string): 0-3, 4-6, or 7-10 (Six 2008) - `age_years` (integer): Age used for the <45 / 45-64 / ≥65 bands - `components` (array): Per-factor 0-2 points - `citation` (object): Six 2008 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 0, "factor": "history", "points": 0, "present": false }, { "value": 0, "factor": "ecg", "points": 0, "present": false }, { "value": 40, "factor": "age", "points": 0, "present": false }, { "value": 0, "factor": "risk_factors", "points": 0, "present": false }, { "value": 0, "factor": "troponin", "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.", "citation": { "authors": "Six AJ, Backus BE, Kelder JC", "doi": "10.1007/BF03086144", "id": "six-2008", "source": "Neth Heart J. 2008;16(6):191-196", "title": "Chest pain in the emergency room: value of the HEART score" }, "formula": "heart", "formula_expression": "HEART = history + ECG + age + risk_factors + troponin; each 0-2; age <45 0, 45-64 1, >=65 2; bands 0-3 / 4-6 / 7-10; max 10", "max_score": 10, "score": 0, "age_years": 40, "heart_band": "0-3" } ``` ## Errors - HTTP 400 `invalid_age`: age must be an integer from 18 to 120 Returned before settlement; you are not charged. - HTTP 400 `invalid_heart_component`: history, ecg, risk_factors, and troponin must each be 0, 1, or 2. Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [TIMI risk score for STEMI](https://magentlab.com/docs/timi-stemi) — Compute the TIMI risk score for ST-elevation myocardial infarction from published bedside factors at presentation. - [TIMI UA/NSTEMI](https://magentlab.com/docs/timi-ua-nstemi) — Compute the TIMI risk score for unstable angina / NSTEMI from age and six caller-assigned flags. ## Payment Required query parameters must be present and valid. Invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign EIP-3009 (scheme exact, assetTransferMethod eip3009) with validBefore = now + accepts[0].maxTimeoutSeconds (600 seconds). That window starts when you sign and must cover wallet confirmation plus CDP verify and settle. Magent retries transient facilitator 429/5xx before answering. Do not send upto or batch-settlement payloads; magent does not offer those schemes. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON echoing accepted, payload, and extensions when present). - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. Settlement happens before the tool runs. HTTP 503 settlement_uncertain or settle_failed: retry the same PAYMENT-SIGNATURE. Mint a new nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. - not offered `batch-settlement`: Not offered. Payment-channel vouchers claimed later in batches. Not the same as POST {items} bulk (that is still exact). Same-path POST {items} is still scheme exact: one EIP-3009 authorization for n times the GET unit. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - Invalid query parameters return HTTP 400 before settlement. You are not charged. - Settlement finishes before the tool executes (paymentFlow upfront). Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.