Emergency · LIVE

SCARF score

SCARF

Sum the four Hardin 2019 Sequential Clinical Assessment of Respiratory Function (SCARF) flags and return the integer total 0-4 plus whether the score is greater than the paper's proposed threshold of 2.

LIVE $0.005 USDC GET /api/calc/scarf

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

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

What it computes

Sum the four Hardin 2019 Sequential Clinical Assessment of Respiratory Function (SCARF) flags and return the integer total 0-4 plus whether the score is greater than the paper's proposed threshold of 2.

When to use

When an agent already has caller-assigned Hardin 2019 SCARF flags for a single snapshot (admission or daily value) after rib fracture and needs the published 0-4 total and score-greater-than-2 flag without inventing named risk classes, serial day-1 versus day-2 inputs, or an analgesia or SSRF order.

When not to use

• Not a medical device.
• Not an analgesia, epidural, or surgical stabilization of rib fractures (SSRF) order.
• magent does not measure incentive spirometry, count respiratory rate, score pain, or examine the chest. The caller assigns the four Hardin 2019 flags (incentive spirometry <50% predicted, respiratory rate >20 breaths/min, numeric pain score ≥5, and inadequate cough unable to clear secretions).
• This is a single snapshot (admission or daily value the caller supplies). It does not require serial day-1 versus day-2 inputs.
• Hardin 2019 proposed a threshold of score greater than 2. magent does not invent 0 = low / 1–2 = intermediate / 3–4 = high classes.

Formula

SCARF = incentive_spirometry_lt_50_predicted + respiratory_rate_gt_20 + pain_score_ge_5 + inadequate_cough; each 1; Hardin 2019; max 4; proposed threshold score > 2 (scarf_gt_2); caller-assigned flags; magent does not measure spirometry or examine the chest

Citation

Title

The Sequential Clinical Assessment of Respiratory Function (SCARF) score: A dynamic pulmonary physiologic score that predicts adverse outcomes in critically ill rib fracture patients

Authors

Hardin KS, Leasia KN, Haenel J, Moore EE, Burlew CC, Pieracci FM

Source

J Trauma Acute Care Surg. 2019;87(6):1260-1268

DOI

10.1097/TA.0000000000002480

Worked example

Also searched as

• SCARF score
• Sequential Clinical Assessment of Respiratory Function
• Hardin SCARF
• rib fracture SCARF
• Hardin 2019 respiratory score
• incentive spirometry rib fracture score
• inadequate cough rib score

Try

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

/api/calc/scarf?incentive_spirometry_lt_50_predicted=false&respiratory_rate_gt_20=false&pain_score_ge_5=false&inadequate_cough=false

Full URL: https://api.magentlab.com/api/calc/scarf?incentive_spirometry_lt_50_predicted=false&respiratory_rate_gt_20=false&pain_score_ge_5=false&inadequate_cough=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/scarf?incentive_spirometry_lt_50_predicted=false&respiratory_rate_gt_20=false&pain_score_ge_5=false&inadequate_cough=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/scarf 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": [
    {
      "inadequate_cough": "false",
      "incentive_spirometry_lt_50_predicted": "false",
      "pain_score_ge_5": "false",
      "respiratory_rate_gt_20": "false"
    },
    {
      "inadequate_cough": "false",
      "incentive_spirometry_lt_50_predicted": "false",
      "pain_score_ge_5": "false",
      "respiratory_rate_gt_20": "false"
    }
  ]
}

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/scarf",
  "items": [
    {
      "components": [
        {
          "factor": "incentive_spirometry_lt_50_predicted",
          "points": 0,
          "present": false
        },
        {
          "factor": "respiratory_rate_gt_20",
          "points": 0,
          "present": false
        },
        {
          "factor": "pain_score_ge_5",
          "points": 0,
          "present": false
        },
        {
          "factor": "inadequate_cough",
          "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": "Hardin KS, Leasia KN, Haenel J, Moore EE, Burlew CC, Pieracci FM",
        "doi": "10.1097/TA.0000000000002480",
        "id": "hardin-2019",
        "pmid": "31425473",
        "source": "J Trauma Acute Care Surg. 2019;87(6):1260-1268",
        "title": "The Sequential Clinical Assessment of Respiratory Function (SCARF) score: A dynamic pulmonary physiologic score that predicts adverse outcomes in critically ill rib fracture patients"
      },
      "formula": "scarf",
      "formula_expression": "SCARF = incentive_spirometry_lt_50_predicted + respiratory_rate_gt_20 + pain_score_ge_5 + inadequate_cough; each 1; Hardin 2019; max 4; proposed threshold score > 2 (scarf_gt_2); caller-assigned flags; magent does not measure spirometry or examine the chest",
      "max_score": 4,
      "score": 0,
      "scarf_gt_2": false
    },
    {
      "components": [
        {
          "factor": "incentive_spirometry_lt_50_predicted",
          "points": 0,
          "present": false
        },
        {
          "factor": "respiratory_rate_gt_20",
          "points": 0,
          "present": false
        },
        {
          "factor": "pain_score_ge_5",
          "points": 0,
          "present": false
        },
        {
          "factor": "inadequate_cough",
          "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": "Hardin KS, Leasia KN, Haenel J, Moore EE, Burlew CC, Pieracci FM",
        "doi": "10.1097/TA.0000000000002480",
        "id": "hardin-2019",
        "pmid": "31425473",
        "source": "J Trauma Acute Care Surg. 2019;87(6):1260-1268",
        "title": "The Sequential Clinical Assessment of Respiratory Function (SCARF) score: A dynamic pulmonary physiologic score that predicts adverse outcomes in critically ill rib fracture patients"
      },
      "formula": "scarf",
      "formula_expression": "SCARF = incentive_spirometry_lt_50_predicted + respiratory_rate_gt_20 + pain_score_ge_5 + inadequate_cough; each 1; Hardin 2019; max 4; proposed threshold score > 2 (scarf_gt_2); caller-assigned flags; magent does not measure spirometry or examine the chest",
      "max_score": 4,
      "score": 0,
      "scarf_gt_2": false
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "factor": "incentive_spirometry_lt_50_predicted",
      "points": 0,
      "present": false
    },
    {
      "factor": "respiratory_rate_gt_20",
      "points": 0,
      "present": false
    },
    {
      "factor": "pain_score_ge_5",
      "points": 0,
      "present": false
    },
    {
      "factor": "inadequate_cough",
      "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": "Hardin KS, Leasia KN, Haenel J, Moore EE, Burlew CC, Pieracci FM",
    "doi": "10.1097/TA.0000000000002480",
    "id": "hardin-2019",
    "pmid": "31425473",
    "source": "J Trauma Acute Care Surg. 2019;87(6):1260-1268",
    "title": "The Sequential Clinical Assessment of Respiratory Function (SCARF) score: A dynamic pulmonary physiologic score that predicts adverse outcomes in critically ill rib fracture patients"
  },
  "formula": "scarf",
  "formula_expression": "SCARF = incentive_spirometry_lt_50_predicted + respiratory_rate_gt_20 + pain_score_ge_5 + inadequate_cough; each 1; Hardin 2019; max 4; proposed threshold score > 2 (scarf_gt_2); caller-assigned flags; magent does not measure spirometry or examine the chest",
  "max_score": 4,
  "score": 0,
  "scarf_gt_2": false
}

Client errors (HTTP 400)

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

Related tools

• RibScore — Sum the six Chapman 2016 RibScore radiographic flags and return the integer total 0-6. That paper associated the score linearly with pneumonia, respiratory failure, and tracheostomy.
• STUMBL — Sum Battle 2014 Table 4 STUMBL points from caller-assigned age, rib fracture count, chronic lung disease, preinjury anticoagulants, and SpO2, and return the Table 5 complication-probability band.

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.