Neurology · LIVE

RACE scale (Pérez de la Ossa)

RACE scale

Sum Pérez de la Ossa 2014 Rapid Arterial oCclusion Evaluation (RACE) scale points from caller-assigned facial palsy, arm motor, leg motor, head and gaze deviation, and cortical signs (aphasia if right hemiparesis, agnosia if left) and return whether the total suggests large arterial occlusion (score ≥5).

LIVE $0.005 USDC GET /api/calc/race

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

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

What it computes

Sum Pérez de la Ossa 2014 Rapid Arterial oCclusion Evaluation (RACE) scale points from caller-assigned facial palsy, arm motor, leg motor, head and gaze deviation, and cortical signs (aphasia if right hemiparesis, agnosia if left) and return whether the total suggests large arterial occlusion (score ≥5).

When to use

When an agent has caller-assigned Pérez de la Ossa 2014 RACE scale items and needs the published 0-9 total and score ≥5 LVO flag, not a stroke diagnosis, transfer order, or race-based equation.

When not to use

• Not a medical device. magent does not examine the patient. Facial palsy, arm motor, leg motor, gaze deviation, hemiparesis side, and cortical points are caller-assigned Pérez de la Ossa 2014 integers.
• Not a stroke diagnosis and not a transfer or thrombolysis order.
• This is the Rapid Arterial oCclusion Evaluation (RACE) scale, not a race-based or ethnicity equation. Cortical points are aphasia when hemiparesis_side is right and agnosia when left (Table 1).
• lvo_suggested is true iff score ≥ 5 (this paper's cutoff). Sensitivity, PPV, and other operating-point statistics are not returned.

Formula

RACE = facial_palsy (0 absent, 1 mild, 2 moderate to severe) + arm_motor (0 normal to mild, 1 moderate, 2 severe) + leg_motor (0 normal to mild, 1 moderate, 2 severe) + gaze_deviation (0 absent, 1 present) + cortical (0–2; aphasia if right hemiparesis, agnosia if left); Pérez de la Ossa 2014 Table 1; max 9; lvo_suggested if score ≥ 5

Citation

Title

Design and validation of a prehospital stroke scale to predict large arterial occlusion: the Rapid Arterial oCclusion Evaluation scale

Authors

Pérez de la Ossa N, Carrera D, Gorchs M, Querol M, Millán M, Gomis M, Dorado L, López-Cancio E, Hernández-Pérez M, Chicharro V, Escalada X, Jiménez X, Dávalos A

Source

Stroke. 2014;45(1):87-91

DOI

10.1161/STROKEAHA.113.003071

Worked example

Also searched as

• RACE scale
• Rapid Arterial oCclusion Evaluation
• RACE score
• Pérez de la Ossa RACE
• prehospital LVO scale
• RACE stroke scale
• Rapid Arterial Occlusion Evaluation

Try

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

/api/calc/race?facial_palsy=0&arm_motor=0&leg_motor=0&gaze_deviation=0&hemiparesis_side=right&cortical=0

Full URL: https://api.magentlab.com/api/calc/race?facial_palsy=0&arm_motor=0&leg_motor=0&gaze_deviation=0&hemiparesis_side=right&cortical=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/race?facial_palsy=0&arm_motor=0&leg_motor=0&gaze_deviation=0&hemiparesis_side=right&cortical=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/race 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": [
    {
      "arm_motor": "0",
      "cortical": "0",
      "facial_palsy": "0",
      "gaze_deviation": "0",
      "hemiparesis_side": "right",
      "leg_motor": "0"
    },
    {
      "arm_motor": "0",
      "cortical": "0",
      "facial_palsy": "0",
      "gaze_deviation": "0",
      "hemiparesis_side": "right",
      "leg_motor": "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/race",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_motor",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "leg_motor",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "gaze_deviation",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "cortical",
          "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": "Pérez de la Ossa N, Carrera D, Gorchs M, Querol M, Millán M, Gomis M, Dorado L, López-Cancio E, Hernández-Pérez M, Chicharro V, Escalada X, Jiménez X, Dávalos A",
        "doi": "10.1161/STROKEAHA.113.003071",
        "id": "perez-de-la-ossa-2014",
        "pmid": "24253548",
        "source": "Stroke. 2014;45(1):87-91",
        "title": "Design and validation of a prehospital stroke scale to predict large arterial occlusion: the Rapid Arterial oCclusion Evaluation scale"
      },
      "formula": "race",
      "formula_expression": "RACE = facial_palsy (0 absent, 1 mild, 2 moderate to severe) + arm_motor (0 normal to mild, 1 moderate, 2 severe) + leg_motor (0 normal to mild, 1 moderate, 2 severe) + gaze_deviation (0 absent, 1 present) + cortical (0–2; aphasia if right hemiparesis, agnosia if left); Pérez de la Ossa 2014 Table 1; max 9; lvo_suggested if score ≥ 5",
      "max_score": 9,
      "score": 0,
      "gaze_deviation": 0,
      "arm_motor": 0,
      "cortical": 0,
      "facial_palsy": 0,
      "hemiparesis_side": "right",
      "leg_motor": 0,
      "lvo_suggested": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_motor",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "leg_motor",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "gaze_deviation",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "cortical",
          "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": "Pérez de la Ossa N, Carrera D, Gorchs M, Querol M, Millán M, Gomis M, Dorado L, López-Cancio E, Hernández-Pérez M, Chicharro V, Escalada X, Jiménez X, Dávalos A",
        "doi": "10.1161/STROKEAHA.113.003071",
        "id": "perez-de-la-ossa-2014",
        "pmid": "24253548",
        "source": "Stroke. 2014;45(1):87-91",
        "title": "Design and validation of a prehospital stroke scale to predict large arterial occlusion: the Rapid Arterial oCclusion Evaluation scale"
      },
      "formula": "race",
      "formula_expression": "RACE = facial_palsy (0 absent, 1 mild, 2 moderate to severe) + arm_motor (0 normal to mild, 1 moderate, 2 severe) + leg_motor (0 normal to mild, 1 moderate, 2 severe) + gaze_deviation (0 absent, 1 present) + cortical (0–2; aphasia if right hemiparesis, agnosia if left); Pérez de la Ossa 2014 Table 1; max 9; lvo_suggested if score ≥ 5",
      "max_score": 9,
      "score": 0,
      "gaze_deviation": 0,
      "arm_motor": 0,
      "cortical": 0,
      "facial_palsy": 0,
      "hemiparesis_side": "right",
      "leg_motor": 0,
      "lvo_suggested": false
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "facial_palsy",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "arm_motor",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "leg_motor",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "gaze_deviation",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "cortical",
      "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": "Pérez de la Ossa N, Carrera D, Gorchs M, Querol M, Millán M, Gomis M, Dorado L, López-Cancio E, Hernández-Pérez M, Chicharro V, Escalada X, Jiménez X, Dávalos A",
    "doi": "10.1161/STROKEAHA.113.003071",
    "id": "perez-de-la-ossa-2014",
    "pmid": "24253548",
    "source": "Stroke. 2014;45(1):87-91",
    "title": "Design and validation of a prehospital stroke scale to predict large arterial occlusion: the Rapid Arterial oCclusion Evaluation scale"
  },
  "formula": "race",
  "formula_expression": "RACE = facial_palsy (0 absent, 1 mild, 2 moderate to severe) + arm_motor (0 normal to mild, 1 moderate, 2 severe) + leg_motor (0 normal to mild, 1 moderate, 2 severe) + gaze_deviation (0 absent, 1 present) + cortical (0–2; aphasia if right hemiparesis, agnosia if left); Pérez de la Ossa 2014 Table 1; max 9; lvo_suggested if score ≥ 5",
  "max_score": 9,
  "score": 0,
  "gaze_deviation": 0,
  "arm_motor": 0,
  "cortical": 0,
  "facial_palsy": 0,
  "hemiparesis_side": "right",
  "leg_motor": 0,
  "lvo_suggested": false
}

Client errors (HTTP 400)

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

Related tools

• LAMS — Sum Llanes 2004 LAMS points from caller-assigned facial droop, arm drift, and grip (LAPSS motor items).

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.