Respiratory · LIVE

COPD Assessment Test

CAT

Sum eight caller-assigned Jones 2009 CAT items (each integer 0-5) and return the published 0-40 total. Does not apply later GOLD CAT impact bands.

LIVE $0.005 USDC GET /api/calc/cat

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

Not a medical device. Not a diagnosis, dose, or listing recommendation.

What it computes

Sum eight caller-assigned Jones 2009 CAT items (each integer 0-5) and return the published 0-40 total. Does not apply later GOLD CAT impact bands.

When to use

When an agent already has Jones 2009 integers 0-5 for the eight CAT items and needs the published total. magent does not interview the patient, diagnose COPD, score BODE, assign GOLD ABE groups, or apply later 0-10/11-20/21-30/31-40 GOLD impact bands.

When not to use

• Not a medical device and not a COPD diagnosis or treatment order.
• Each of the eight items is a caller-assigned integer 0-5. magent does not interview the patient.
• This is Jones 2009 CAT only (eight items; max 40). magent does not score BODE and does not assign GOLD ABE groups.
• Jones 2009 published no GOLD 0-10 / 11-20 / 21-30 / 31-40 CAT impact bands. This tool returns score and max_score only. It does not apply later website or GOLD cutoffs.

Formula

CAT = cough + phlegm + chest_tightness + breathlessness + activities + confidence + sleep + energy; each caller-assigned 0-5; Jones 2009 eight items; max 40; no GOLD 0-10 / 11-20 / 21-30 / 31-40 impact bands

Citation

Title

Development and first validation of the COPD Assessment Test

Authors

Jones PW, Harding G, Berry P, Wiklund I, Chen WH, Kline Leidy N

Source

Eur Respir J. 2009;34(3):648-654

DOI

10.1183/09031936.00102509

Worked example

Also searched as

• COPD Assessment Test
• CAT score
• Jones 2009 CAT
• COPD CAT questionnaire
• eight-item CAT
• COPD health status CAT

Try

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

/api/calc/cat?cough=0&phlegm=0&chest_tightness=0&breathlessness=0&activities=0&confidence=0&sleep=0&energy=0

Full URL: https://api.magentlab.com/api/calc/cat?cough=0&phlegm=0&chest_tightness=0&breathlessness=0&activities=0&confidence=0&sleep=0&energy=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/cat?cough=0&phlegm=0&chest_tightness=0&breathlessness=0&activities=0&confidence=0&sleep=0&energy=0"

Parameters

Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

POST /api/calc/cat Max 25 unit_amount + extra_item_amount * (n - 1) extra $0.002 PREVIEW

• 1 to 25 items. Each item uses the same keys as the GET query parameters.
• POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
• 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": [
    {
      "activities": "0",
      "breathlessness": "0",
      "chest_tightness": "0",
      "confidence": "0",
      "cough": "0",
      "energy": "0",
      "phlegm": "0",
      "sleep": "0"
    },
    {
      "activities": "0",
      "breathlessness": "0",
      "chest_tightness": "0",
      "confidence": "0",
      "cough": "0",
      "energy": "0",
      "phlegm": "0",
      "sleep": "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/cat",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "cough",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "phlegm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "chest_tightness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "breathlessness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "activities",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "confidence",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sleep",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "energy",
          "points": 0,
          "present": true
        }
      ],
      "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": "Jones PW, Harding G, Berry P, Wiklund I, Chen WH, Kline Leidy N",
        "doi": "10.1183/09031936.00102509",
        "id": "jones-2009",
        "pmid": "19720809",
        "source": "Eur Respir J. 2009;34(3):648-654",
        "title": "Development and first validation of the COPD Assessment Test"
      },
      "formula": "cat",
      "formula_expression": "CAT = cough + phlegm + chest_tightness + breathlessness + activities + confidence + sleep + energy; each caller-assigned 0-5; Jones 2009 eight items; max 40; no GOLD 0-10 / 11-20 / 21-30 / 31-40 impact bands",
      "max_score": 40,
      "score": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "cough",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "phlegm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "chest_tightness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "breathlessness",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "activities",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "confidence",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sleep",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "energy",
          "points": 0,
          "present": true
        }
      ],
      "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": "Jones PW, Harding G, Berry P, Wiklund I, Chen WH, Kline Leidy N",
        "doi": "10.1183/09031936.00102509",
        "id": "jones-2009",
        "pmid": "19720809",
        "source": "Eur Respir J. 2009;34(3):648-654",
        "title": "Development and first validation of the COPD Assessment Test"
      },
      "formula": "cat",
      "formula_expression": "CAT = cough + phlegm + chest_tightness + breathlessness + activities + confidence + sleep + energy; each caller-assigned 0-5; Jones 2009 eight items; max 40; no GOLD 0-10 / 11-20 / 21-30 / 31-40 impact bands",
      "max_score": 40,
      "score": 0
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "cough",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "phlegm",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "chest_tightness",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "breathlessness",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "activities",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "confidence",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "sleep",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "energy",
      "points": 0,
      "present": true
    }
  ],
  "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": "Jones PW, Harding G, Berry P, Wiklund I, Chen WH, Kline Leidy N",
    "doi": "10.1183/09031936.00102509",
    "id": "jones-2009",
    "pmid": "19720809",
    "source": "Eur Respir J. 2009;34(3):648-654",
    "title": "Development and first validation of the COPD Assessment Test"
  },
  "formula": "cat",
  "formula_expression": "CAT = cough + phlegm + chest_tightness + breathlessness + activities + confidence + sleep + energy; each caller-assigned 0-5; Jones 2009 eight items; max 40; no GOLD 0-10 / 11-20 / 21-30 / 31-40 impact bands",
  "max_score": 40,
  "score": 0
}

Client errors (HTTP 400)

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

Related tools

• BODE — Sum Celli 2004 BODE points from BMI, FEV1 percent predicted, MMRC dyspnea, and 6-minute walk distance.
• GOLD spirometric grade — Apply the 2017 GOLD executive summary spirometric classification: obstruction when post-bronchodilator FEV1/FVC is < 0.70, then GOLD grades 1-4 from FEV1 percent predicted.

Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, 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

• HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
• exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. 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.