STUMBL blunt chest wall trauma score

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.

LIVE $0.005 USDC GET /api/calc/stumbl

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

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

What it computes

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.

When to use

When an agent has already assigned Battle 2014 Table 4 inputs after blunt chest wall trauma and needs the published integer STUMBL total and Table 5 band, not a chest exam, rib count, disposition, or ICU order.

When not to use

Not a medical device. magent does not examine the chest or count ribs. Rib count and SpO2 are caller-assigned.
Not a disposition, discharge, ICU-admission, or anticoagulant order. Table 5 bands are published complication probabilities (13/29/52/70/80/88%), not later secondary-paper cutoffs.
Age is an integer from 1 to 120 (1 point per decade starting at 10; not the adult 18–120 clamp). Rib count is an integer from 0 to 24. SpO2 is an integer from 50 to 100. No published point ceiling; Table 5 uses 31+ as the top band.

Formula

STUMBL = div(age, 10) + 3*rib_count + chronic_lung_disease 5 + preinjury_anticoagulants 4 + spo2 (>=95 0 else 2*(1+div(94-spo2_percent, 5))); Battle 2014 Table 4; Table 5 0-10 13%, 11-15 29%, 16-20 52%, 21-25 70%, 26-30 80%, 31+ 88%

Citation

Title: Predicting outcomes after blunt chest wall trauma: development and external validation of a new prognostic model
Authors: Battle CE, Hutchings H, Lovett S, Bouamra O, Jones S, Sen A, Gagg J, Robinson D, Hartford-Beynon J, Williams J, Evans A
Source: Crit Care. 2014;18(3):R98
DOI: 10.1186/cc13873

Worked example

Paper 24-point example

Given: age=67chronic_lung_disease=truepreinjury_anticoagulants=falserib_count=3spo2_percent=87

age 67 → 6; 3 ribs → 9; chronic lung true → 5; anticoagulants false → 0; SpO2 87 → 4
Score = 24; stumbl_band band_21_25; complication_probability_percent 70

Zero-point child, no fractures

Given: age=5chronic_lung_disease=falsepreinjury_anticoagulants=falserib_count=0spo2_percent=98

age 5 → 0; 0 ribs → 0; flags false → 0; SpO2 98 → 0
Score = 0; stumbl_band band_0_10; complication_probability_percent 13

Paper example plus anticoagulants

Given: age=67chronic_lung_disease=truepreinjury_anticoagulants=truerib_count=3spo2_percent=87

paper 24 + anticoagulants 4
Score = 28; stumbl_band band_26_30; complication_probability_percent 80; icu_admission_cutoff true

Also searched as

STUMBL score
Battle score
blunt chest wall trauma score
rib fracture complication score
Battle 2014 prognostic model
chest wall trauma risk score
STUMBL Battle score

Try

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

/api/calc/stumbl?age=67&rib_count=3&chronic_lung_disease=true&preinjury_anticoagulants=false&spo2_percent=87

Full URL: https://api.magentlab.com/api/calc/stumbl?age=67&rib_count=3&chronic_lung_disease=true&preinjury_anticoagulants=false&spo2_percent=87

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/stumbl?age=67&rib_count=3&chronic_lung_disease=true&preinjury_anticoagulants=false&spo2_percent=87"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years, integer 1–120. Battle 2014 Table 4: 1 point per additional 10-year increase starting at 10 (div(age, 10); age 10 scores 1, age 67 scores 6, age 1–9 scores 0). Not the adult 18–120 clamp.
`rib_count`	integer	required	Caller-assigned number of rib fractures, integer 0–24. Battle 2014 Table 4: 3 points per additional rib fracture (3 ribs scores 9). magent does not examine the chest or count ribs.
`chronic_lung_disease`	boolean	required	Pre-injury chronic lung disease as assigned by the caller (Battle 2014 Table 4). true or false. true scores 5.
`preinjury_anticoagulants`	boolean	required	Pre-injury anticoagulant use as assigned by the caller (Battle 2014 Table 4). true or false. true scores 4.
`spo2_percent`	integer	required	Oxygen saturation percent, integer 50–100. Battle 2014 Table 4 footnote c: 2 points per 5% decrease starting at 94% (≥95 scores 0; else 2*(1+div(94-spo2_percent, 5)); 87% scores 4). magent does not measure SpO2.

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/stumbl 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": "67",
      "chronic_lung_disease": "true",
      "preinjury_anticoagulants": "false",
      "rib_count": "3",
      "spo2_percent": "87"
    },
    {
      "age": "67",
      "chronic_lung_disease": "true",
      "preinjury_anticoagulants": "false",
      "rib_count": "3",
      "spo2_percent": "87"
    }
  ]
}

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/stumbl",
  "items": [
    {
      "components": [
        {
          "value": 67,
          "factor": "age",
          "points": 6,
          "present": true
        },
        {
          "value": 3,
          "factor": "rib_count",
          "points": 9,
          "present": true
        },
        {
          "factor": "chronic_lung_disease",
          "points": 5,
          "present": true
        },
        {
          "factor": "preinjury_anticoagulants",
          "points": 0,
          "present": false
        },
        {
          "value": 87,
          "factor": "spo2_percent",
          "points": 4,
          "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": "Battle CE, Hutchings H, Lovett S, Bouamra O, Jones S, Sen A, Gagg J, Robinson D, Hartford-Beynon J, Williams J, Evans A",
        "doi": "10.1186/cc13873",
        "id": "battle-2014",
        "pmid": "24887537",
        "source": "Crit Care. 2014;18(3):R98",
        "title": "Predicting outcomes after blunt chest wall trauma: development and external validation of a new prognostic model"
      },
      "formula": "stumbl",
      "formula_expression": "STUMBL = div(age, 10) + 3*rib_count + chronic_lung_disease 5 + preinjury_anticoagulants 4 + spo2 (>=95 0 else 2*(1+div(94-spo2_percent, 5))); Battle 2014 Table 4; Table 5 0-10 13%, 11-15 29%, 16-20 52%, 21-25 70%, 26-30 80%, 31+ 88%",
      "score": 24,
      "age_years": 67,
      "chronic_lung_disease": true,
      "spo2_percent": 87,
      "at_risk_for_complications": true,
      "complication_probability_percent": 70,
      "icu_admission_cutoff": false,
      "preinjury_anticoagulants": false,
      "rib_count": 3,
      "stumbl_band": "band_21_25"
    },
    {
      "components": [
        {
          "value": 67,
          "factor": "age",
          "points": 6,
          "present": true
        },
        {
          "value": 3,
          "factor": "rib_count",
          "points": 9,
          "present": true
        },
        {
          "factor": "chronic_lung_disease",
          "points": 5,
          "present": true
        },
        {
          "factor": "preinjury_anticoagulants",
          "points": 0,
          "present": false
        },
        {
          "value": 87,
          "factor": "spo2_percent",
          "points": 4,
          "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": "Battle CE, Hutchings H, Lovett S, Bouamra O, Jones S, Sen A, Gagg J, Robinson D, Hartford-Beynon J, Williams J, Evans A",
        "doi": "10.1186/cc13873",
        "id": "battle-2014",
        "pmid": "24887537",
        "source": "Crit Care. 2014;18(3):R98",
        "title": "Predicting outcomes after blunt chest wall trauma: development and external validation of a new prognostic model"
      },
      "formula": "stumbl",
      "formula_expression": "STUMBL = div(age, 10) + 3*rib_count + chronic_lung_disease 5 + preinjury_anticoagulants 4 + spo2 (>=95 0 else 2*(1+div(94-spo2_percent, 5))); Battle 2014 Table 4; Table 5 0-10 13%, 11-15 29%, 16-20 52%, 21-25 70%, 26-30 80%, 31+ 88%",
      "score": 24,
      "age_years": 67,
      "chronic_lung_disease": true,
      "spo2_percent": 87,
      "at_risk_for_complications": true,
      "complication_probability_percent": 70,
      "icu_admission_cutoff": false,
      "preinjury_anticoagulants": false,
      "rib_count": 3,
      "stumbl_band": "band_21_25"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	stumbl
`formula_expression`	string	Exact expression used
`score`	integer	STUMBL / Battle integer points
`stumbl_band`	string	Battle 2014 Table 5 band: band_0_10, band_11_15, band_16_20, band_21_25, band_26_30, or band_31_plus. A probability band, not a disposition or ICU order.
`complication_probability_percent`	integer	Battle 2014 Table 5 predicted complication probability: 13, 29, 52, 70, 80, or 88
`at_risk_for_complications`	boolean	true when score ≥11 (Battle 2014 at-risk-for-complications cutoff). Not a treatment order.
`icu_admission_cutoff`	boolean	true when score ≥26 (Battle 2014 ICU-admission cutoff). Not an ICU admission order.
`age_years`	integer	Age in years used for div(age, 10)
`rib_count`	integer	Caller-assigned rib fracture count used
`chronic_lung_disease`	boolean	Caller-assigned chronic lung disease flag used
`preinjury_anticoagulants`	boolean	Caller-assigned pre-injury anticoagulant flag used
`spo2_percent`	integer	Oxygen saturation percent used
`components`	array	Per-factor points
`citation`	object	Battle et al. Crit Care 2014 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 67,
      "factor": "age",
      "points": 6,
      "present": true
    },
    {
      "value": 3,
      "factor": "rib_count",
      "points": 9,
      "present": true
    },
    {
      "factor": "chronic_lung_disease",
      "points": 5,
      "present": true
    },
    {
      "factor": "preinjury_anticoagulants",
      "points": 0,
      "present": false
    },
    {
      "value": 87,
      "factor": "spo2_percent",
      "points": 4,
      "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": "Battle CE, Hutchings H, Lovett S, Bouamra O, Jones S, Sen A, Gagg J, Robinson D, Hartford-Beynon J, Williams J, Evans A",
    "doi": "10.1186/cc13873",
    "id": "battle-2014",
    "pmid": "24887537",
    "source": "Crit Care. 2014;18(3):R98",
    "title": "Predicting outcomes after blunt chest wall trauma: development and external validation of a new prognostic model"
  },
  "formula": "stumbl",
  "formula_expression": "STUMBL = div(age, 10) + 3*rib_count + chronic_lung_disease 5 + preinjury_anticoagulants 4 + spo2 (>=95 0 else 2*(1+div(94-spo2_percent, 5))); Battle 2014 Table 4; Table 5 0-10 13%, 11-15 29%, 16-20 52%, 21-25 70%, 26-30 80%, 31+ 88%",
  "score": 24,
  "age_years": 67,
  "chronic_lung_disease": true,
  "spo2_percent": 87,
  "at_risk_for_complications": true,
  "complication_probability_percent": 70,
  "icu_admission_cutoff": false,
  "preinjury_anticoagulants": false,
  "rib_count": 3,
  "stumbl_band": "band_21_25"
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_stumbl_age`	age must be an integer from 1 through 120 (Battle 2014 STUMBL; 1 point per decade starting at 10; not the adult 18-120 clamp). Returned before settlement; you are not charged.
400	`invalid_rib_count`	rib_count must be an integer from 0 through 24 (Battle 2014 STUMBL Table 4). Returned before settlement; you are not charged.
400	`invalid_spo2`	spo2_percent must be a number from 50 to 100. Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false 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

ISS — Compute the Baker 1974 Injury Severity Score as the sum of squares of the three highest caller-assigned AIS body-region grades, or 75 if any region is AIS 6.
TASH score — Sum the seven Yücel 2006 TASH (Trauma Associated Severe Hemorrhage) nested less-than point bands and return the published 0–28 total as a surrogate for mass transfusion after multiple trauma.

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.