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Canadian C-spine rule

Apply the Stiell 2001 Canadian C-spine rule and return whether cervical radiography is indicated from caller-assigned age, high-risk factors, low-risk factors, and neck rotation.

LIVE $0.005 USDC GET /api/calc/canadian_cspine

Markdown: /docs/canadian-c-spine.md · Canonical: https://magentlab.com/docs/canadian-c-spine

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

What it computes

Apply the Stiell 2001 Canadian C-spine rule and return whether cervical radiography is indicated from caller-assigned age, high-risk factors, low-risk factors, and neck rotation.

When to use

When an agent has caller-assigned findings after blunt neck trauma in an alert, stable adult and needs the published Canadian C-spine radiography rule, not NEXUS.

When not to use

• Not a diagnosis of cervical spine injury. magent does not examine the neck.
• This tool is the Stiell 2001 Canadian C-spine rule only. It is not NEXUS and not a pediatric C-spine rule.
• Population is alert, stable blunt trauma in adults with GCS 15 as published. magent does not take GCS; the caller assigns the findings.
• Dangerous mechanism is caller-assigned. Published dangerous mechanisms: fall from elevation ≥3 feet/5 stairs; axial load to head; MVC high speed (>100 km/h), rollover, or ejection; motorized recreational vehicles; bicycle collision.
• Simple rear-end MVC is caller-assigned. Published exclusions from simple rear-end: pushed into oncoming traffic, hit by a bus or large truck, rollover, hit by a high-speed vehicle.

Formula

xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45

Citation

Title

The Canadian C-spine rule for radiography in alert and stable trauma patients

Authors

Stiell IG, Wells GA, Vandemheen KL, et al.

Source

JAMA. 2001;286(15):1841-1848

DOI

10.1001/jama.286.15.1841

Worked example

Also searched as

• Canadian C-spine rule
• Canadian C-Spine Rule
• CCR C-spine
• Stiell C-spine rule
• cervical spine radiography rule
• Canadian cervical spine rule
• Stiell 2001 C-spine

Try

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

/api/calc/canadian_cspine?age=40&dangerous_mechanism=false&paresthesias_extremities=false&simple_rear_end_mvc=false&sitting_in_ed=false&ambulatory_since_injury=false&delayed_neck_pain=true&midline_cspine_tenderness=true&able_to_rotate_45=true

Full URL: https://api.magentlab.com/api/calc/canadian_cspine?age=40&dangerous_mechanism=false&paresthesias_extremities=false&simple_rear_end_mvc=false&sitting_in_ed=false&ambulatory_since_injury=false&delayed_neck_pain=true&midline_cspine_tenderness=true&able_to_rotate_45=true

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/canadian_cspine?age=40&dangerous_mechanism=false&paresthesias_extremities=false&simple_rear_end_mvc=false&sitting_in_ed=false&ambulatory_since_injury=false&delayed_neck_pain=true&midline_cspine_tenderness=true&able_to_rotate_45=true"

Parameters

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/canadian_cspine 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": [
    {
      "able_to_rotate_45": "true",
      "age": "40",
      "ambulatory_since_injury": "false",
      "dangerous_mechanism": "false",
      "delayed_neck_pain": "true",
      "midline_cspine_tenderness": "true",
      "paresthesias_extremities": "false",
      "simple_rear_end_mvc": "false",
      "sitting_in_ed": "false"
    },
    {
      "able_to_rotate_45": "true",
      "age": "40",
      "ambulatory_since_injury": "false",
      "dangerous_mechanism": "false",
      "delayed_neck_pain": "true",
      "midline_cspine_tenderness": "true",
      "paresthesias_extremities": "false",
      "simple_rear_end_mvc": "false",
      "sitting_in_ed": "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/canadian_cspine",
  "items": [
    {
      "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": "Stiell IG, Wells GA, Vandemheen KL, et al.",
        "doi": "10.1001/jama.286.15.1841",
        "id": "stiell-2001",
        "source": "JAMA. 2001;286(15):1841-1848",
        "title": "The Canadian C-spine rule for radiography in alert and stable trauma patients"
      },
      "formula": "canadian_c_spine",
      "formula_expression": "xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45",
      "age_years": 40,
      "able_to_rotate_45": true,
      "criteria": [
        {
          "value": 40,
          "factor": "high_risk",
          "age_ge_65": false,
          "dangerous_mechanism": false,
          "paresthesias_extremities": false,
          "met": false
        },
        {
          "factor": "low_risk_allows_rom",
          "ambulatory_since_injury": false,
          "delayed_neck_pain": true,
          "midline_cspine_tenderness": true,
          "simple_rear_end_mvc": false,
          "sitting_in_ed": false,
          "met": true
        },
        {
          "factor": "able_to_rotate_45",
          "met": true
        }
      ],
      "high_risk": false,
      "low_risk_allows_rom": true,
      "xray_indicated": 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": "Stiell IG, Wells GA, Vandemheen KL, et al.",
        "doi": "10.1001/jama.286.15.1841",
        "id": "stiell-2001",
        "source": "JAMA. 2001;286(15):1841-1848",
        "title": "The Canadian C-spine rule for radiography in alert and stable trauma patients"
      },
      "formula": "canadian_c_spine",
      "formula_expression": "xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45",
      "age_years": 40,
      "able_to_rotate_45": true,
      "criteria": [
        {
          "value": 40,
          "factor": "high_risk",
          "age_ge_65": false,
          "dangerous_mechanism": false,
          "paresthesias_extremities": false,
          "met": false
        },
        {
          "factor": "low_risk_allows_rom",
          "ambulatory_since_injury": false,
          "delayed_neck_pain": true,
          "midline_cspine_tenderness": true,
          "simple_rear_end_mvc": false,
          "sitting_in_ed": false,
          "met": true
        },
        {
          "factor": "able_to_rotate_45",
          "met": true
        }
      ],
      "high_risk": false,
      "low_risk_allows_rom": true,
      "xray_indicated": false
    }
  ]
}

Response

Example JSON

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

{
  "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": "Stiell IG, Wells GA, Vandemheen KL, et al.",
    "doi": "10.1001/jama.286.15.1841",
    "id": "stiell-2001",
    "source": "JAMA. 2001;286(15):1841-1848",
    "title": "The Canadian C-spine rule for radiography in alert and stable trauma patients"
  },
  "formula": "canadian_c_spine",
  "formula_expression": "xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45",
  "age_years": 40,
  "able_to_rotate_45": true,
  "criteria": [
    {
      "value": 40,
      "factor": "high_risk",
      "age_ge_65": false,
      "dangerous_mechanism": false,
      "paresthesias_extremities": false,
      "met": false
    },
    {
      "factor": "low_risk_allows_rom",
      "ambulatory_since_injury": false,
      "delayed_neck_pain": true,
      "midline_cspine_tenderness": true,
      "simple_rear_end_mvc": false,
      "sitting_in_ed": false,
      "met": true
    },
    {
      "factor": "able_to_rotate_45",
      "met": true
    }
  ],
  "high_risk": false,
  "low_risk_allows_rom": true,
  "xray_indicated": false
}

Client errors (HTTP 400)

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

Related tools

• Ottawa ankle rule — Apply the Stiell 1992 Ottawa ankle rule and return whether an ankle x-ray series is indicated from caller-assigned malleolar pain, malleolar bone tenderness, and inability to bear weight.

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.