Infection / VTE · LIVE

CURB-65 pneumonia severity

CURB-65

Compute the CURB-65 community-acquired pneumonia severity score from age and discrete flags.

LIVE $0.005 USDC GET /api/calc/curb65

Markdown: /docs/curb65.md · Canonical: https://magentlab.com/docs/curb65

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

What it computes

Compute the CURB-65 community-acquired pneumonia severity score from age and discrete flags.

When to use

When an agent needs the published CURB-65 total and must not invent points from a chart narrative.

When not to use

• Not a treatment recommendation and not a site-of-care decision.
• urea_high is a boolean flag. magent does not convert BUN mg/dL to urea mmol/L.

Formula

CURB-65 = confusion + urea_high + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 5

Citation

Title

Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study

Authors

Lim WS, van der Eerden MM, Laing R, et al.

Source

Thorax. 2003;58(5):377-382

DOI

10.1136/thorax.58.5.377

Worked example

Also searched as

• CURB 65
• CURB65 score
• Lim pneumonia score
• CAP severity

Try

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

/api/calc/curb65?age=70&confusion=true&urea_high=true&respiratory_rate_ge_30=false&low_blood_pressure=false

Full URL: https://api.magentlab.com/api/calc/curb65?age=70&confusion=true&urea_high=true&respiratory_rate_ge_30=false&low_blood_pressure=false

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/curb65?age=70&confusion=true&urea_high=true&respiratory_rate_ge_30=false&low_blood_pressure=false"

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/curb65 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": [
    {
      "age": "70",
      "confusion": "true",
      "low_blood_pressure": "false",
      "respiratory_rate_ge_30": "false",
      "urea_high": "true"
    },
    {
      "age": "70",
      "confusion": "true",
      "low_blood_pressure": "false",
      "respiratory_rate_ge_30": "false",
      "urea_high": "true"
    }
  ]
}

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/curb65",
  "items": [
    {
      "components": [
        {
          "factor": "confusion",
          "points": 1,
          "present": true
        },
        {
          "factor": "urea_high",
          "points": 1,
          "present": true
        },
        {
          "factor": "respiratory_rate_ge_30",
          "points": 0,
          "present": false
        },
        {
          "factor": "low_blood_pressure",
          "points": 0,
          "present": false
        },
        {
          "value": 70,
          "factor": "age_ge_65",
          "points": 1,
          "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.",
      "age_years": 70,
      "citation": {
        "authors": "Lim WS, van der Eerden MM, Laing R, et al.",
        "doi": "10.1136/thorax.58.5.377",
        "id": "lim-2003",
        "source": "Thorax. 2003;58(5):377-382",
        "title": "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study"
      },
      "formula": "curb65",
      "formula_expression": "CURB-65 = confusion + urea_high + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 5",
      "max_score": 5,
      "score": 3
    },
    {
      "components": [
        {
          "factor": "confusion",
          "points": 1,
          "present": true
        },
        {
          "factor": "urea_high",
          "points": 1,
          "present": true
        },
        {
          "factor": "respiratory_rate_ge_30",
          "points": 0,
          "present": false
        },
        {
          "factor": "low_blood_pressure",
          "points": 0,
          "present": false
        },
        {
          "value": 70,
          "factor": "age_ge_65",
          "points": 1,
          "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.",
      "age_years": 70,
      "citation": {
        "authors": "Lim WS, van der Eerden MM, Laing R, et al.",
        "doi": "10.1136/thorax.58.5.377",
        "id": "lim-2003",
        "source": "Thorax. 2003;58(5):377-382",
        "title": "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study"
      },
      "formula": "curb65",
      "formula_expression": "CURB-65 = confusion + urea_high + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 5",
      "max_score": 5,
      "score": 3
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "factor": "confusion",
      "points": 1,
      "present": true
    },
    {
      "factor": "urea_high",
      "points": 1,
      "present": true
    },
    {
      "factor": "respiratory_rate_ge_30",
      "points": 0,
      "present": false
    },
    {
      "factor": "low_blood_pressure",
      "points": 0,
      "present": false
    },
    {
      "value": 70,
      "factor": "age_ge_65",
      "points": 1,
      "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.",
  "age_years": 70,
  "citation": {
    "authors": "Lim WS, van der Eerden MM, Laing R, et al.",
    "doi": "10.1136/thorax.58.5.377",
    "id": "lim-2003",
    "source": "Thorax. 2003;58(5):377-382",
    "title": "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study"
  },
  "formula": "curb65",
  "formula_expression": "CURB-65 = confusion + urea_high + respiratory_rate_ge_30 + low_blood_pressure + age_ge_65; max 5",
  "max_score": 5,
  "score": 3
}

Client errors (HTTP 400)

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

Related tools

• Wells PE — Compute the Wells pulmonary-embolism probability score and return three-tier and two-tier bands.
• Wells DVT — Compute the Wells deep-vein thrombosis probability score and return three-tier and two-tier bands.

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.