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HEART score

Compute the HEART score as age points plus caller-assigned history, ECG, risk factors, and troponin (each 0-2).

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

LIVE $0.005 USDC GET /api/calc/heart

Markdown: /docs/heart.md · Canonical: https://magentlab.com/docs/heart

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

Title: Chest pain in the emergency room: value of the HEART score
Authors: Six AJ, Backus BE, Kelder JC
Source: Neth Heart J. 2008;16(6):191-196
DOI: 10.1007/BF03086144

Worked example

Age 40, all components 0

Given: age=40ecg=0history=0risk_factors=0troponin=0

Age 40 (<45) → 0; history 0; ECG 0; risk_factors 0; troponin 0
Score = 0; band 0-3

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/calc/heart?age=40&history=0&ecg=0&risk_factors=0&troponin=0

Full URL: https://api.magentlab.com/api/calc/heart?age=40&history=0&ecg=0&risk_factors=0&troponin=0

Call

Expect HTTP 402 until you retry with PAYMENT-SIGNATURE. Incomplete query params return HTTP 400 before any quote or charge.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/calc/heart?age=40&history=0&ecg=0&risk_factors=0&troponin=0"

Parameters

Name	Type	Required	Description
`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.

POST /api/calc/heart Max 25 unit_amount * n 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 (fixture)

{
  "items": [
    {
      "age": "40",
      "ecg": "0",
      "history": "0",
      "risk_factors": "0",
      "troponin": "0"
    },
    {
      "age": "40",
      "ecg": "0",
      "history": "0",
      "risk_factors": "0",
      "troponin": "0"
    }
  ]
}

Open bulk paywall →

Opens a two-item fixture on the API host. Unpaid browsers get the same MetaMask paywall as GET; Pay retries POST with those items.

Example 200 (fixture)

{
  "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

Field	Type	Description
`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

Machine form of the same example. Frozen fixture. Not a live lookup.

{
  "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"
}

Client errors (HTTP 400)

Invalid params return 400 without charge. Shared HTTP 402 and 503 meanings: Payments.

HTTP	Code	When
400	`invalid_age`	age must be an integer from 18 to 120 Returned before settlement; you are not charged.
400	`invalid_heart_component`	history, ecg, risk_factors, and troponin must each be 0, 1, or 2. Returned before settlement; you are not charged.
400	`invalid_items`	POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
400	`invalid_item_count`	items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
400	`invalid_item`	each items entry must be a JSON object Returned before settlement; you are not charged.

Related tools

TIMI risk score for STEMI — Compute the TIMI risk score for ST-elevation myocardial infarction from published bedside factors at presentation.
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. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote: retry the same PAYMENT-SIGNATURE. Full handshake and shared payment errors: Payments. Stdio MCP: /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.