Neurology · LIVE

Cincinnati Prehospital Stroke Severity Scale (CP-SSS)

CP-SSS

Sum Katz 2015 Cincinnati Prehospital Stroke Severity Scale (CP-SSS) points from caller-assigned conjugate gaze deviation, abnormal level of consciousness, and arm weakness, and return whether the total suggests severe stroke (score ≥2).

LIVE $0.005 USDC GET /api/calc/cpsss

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

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

What it computes

Sum Katz 2015 Cincinnati Prehospital Stroke Severity Scale (CP-SSS) points from caller-assigned conjugate gaze deviation, abnormal level of consciousness, and arm weakness, and return whether the total suggests severe stroke (score ≥2).

When to use

When an agent has caller-assigned Katz 2015 CP-SSS items and needs the published 0-4 total and score ≥2 severe-stroke flag, not the 3-item Cincinnati Prehospital Stroke Scale facial/arm/speech screen, NIHSS, or a tPA decision.

When not to use

• Not a medical device. magent does not examine the patient. Conjugate gaze deviation, level of consciousness, and arm weakness are caller-assigned Katz 2015 findings.
• This is the Cincinnati Prehospital Stroke Severity Scale (CP-SSS), not the 3-item Cincinnati Prehospital Stroke Scale (CPSS) facial droop, arm drift, and speech screen.
• Not NIHSS and not a tPA, thrombolysis, or transfer order. severe_stroke_suggested is true iff score ≥ 2 (this paper's cutoff for NIHSS ≥15 / LVO prediction). Sensitivity, PPV, and other operating-point statistics are not returned.

Formula

CP-SSS = gaze_deviation (2 if present, else 0) + loc_abnormal (1 if cannot answer age or current month, or cannot follow commands) + arm_weakness (1 if cannot hold arm 10 s); Katz 2015; max 4; severe_stroke_suggested if score ≥ 2

Citation

Title

Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale

Authors

Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP

Source

Stroke. 2015;46(6):1508-1512

DOI

10.1161/STROKEAHA.115.008804

Worked example

Also searched as

• Cincinnati Prehospital Stroke Severity Scale
• CP-SSS
• Katz CP-SSS
• Cincinnati Prehospital Stroke Severity
• Katz 2015 stroke scale
• prehospital stroke severity scale
• CPSSS

Try

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

/api/calc/cpsss?gaze_deviation=0&loc_abnormal=false&arm_weakness=false

Full URL: https://api.magentlab.com/api/calc/cpsss?gaze_deviation=0&loc_abnormal=false&arm_weakness=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/cpsss?gaze_deviation=0&loc_abnormal=false&arm_weakness=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/cpsss 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_weakness": "false",
      "gaze_deviation": "0",
      "loc_abnormal": "false"
    },
    {
      "arm_weakness": "false",
      "gaze_deviation": "0",
      "loc_abnormal": "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/cpsss",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "gaze_deviation",
          "points": 0,
          "present": false
        },
        {
          "factor": "loc_abnormal",
          "points": 0,
          "present": false
        },
        {
          "factor": "arm_weakness",
          "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": "Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP",
        "doi": "10.1161/STROKEAHA.115.008804",
        "id": "katz-2015",
        "pmid": "25899242",
        "source": "Stroke. 2015;46(6):1508-1512",
        "title": "Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale"
      },
      "formula": "cpsss",
      "formula_expression": "CP-SSS = gaze_deviation (2 if present, else 0) + loc_abnormal (1 if cannot answer age or current month, or cannot follow commands) + arm_weakness (1 if cannot hold arm 10 s); Katz 2015; max 4; severe_stroke_suggested if score ≥ 2",
      "max_score": 4,
      "score": 0,
      "arm_weakness": false,
      "gaze_deviation": 0,
      "loc_abnormal": false,
      "severe_stroke_suggested": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "gaze_deviation",
          "points": 0,
          "present": false
        },
        {
          "factor": "loc_abnormal",
          "points": 0,
          "present": false
        },
        {
          "factor": "arm_weakness",
          "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": "Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP",
        "doi": "10.1161/STROKEAHA.115.008804",
        "id": "katz-2015",
        "pmid": "25899242",
        "source": "Stroke. 2015;46(6):1508-1512",
        "title": "Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale"
      },
      "formula": "cpsss",
      "formula_expression": "CP-SSS = gaze_deviation (2 if present, else 0) + loc_abnormal (1 if cannot answer age or current month, or cannot follow commands) + arm_weakness (1 if cannot hold arm 10 s); Katz 2015; max 4; severe_stroke_suggested if score ≥ 2",
      "max_score": 4,
      "score": 0,
      "arm_weakness": false,
      "gaze_deviation": 0,
      "loc_abnormal": false,
      "severe_stroke_suggested": false
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "gaze_deviation",
      "points": 0,
      "present": false
    },
    {
      "factor": "loc_abnormal",
      "points": 0,
      "present": false
    },
    {
      "factor": "arm_weakness",
      "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": "Katz BS, McMullan JT, Sucharew H, Adeoye O, Broderick JP",
    "doi": "10.1161/STROKEAHA.115.008804",
    "id": "katz-2015",
    "pmid": "25899242",
    "source": "Stroke. 2015;46(6):1508-1512",
    "title": "Design and validation of a prehospital scale to predict stroke severity: Cincinnati Prehospital Stroke Severity Scale"
  },
  "formula": "cpsss",
  "formula_expression": "CP-SSS = gaze_deviation (2 if present, else 0) + loc_abnormal (1 if cannot answer age or current month, or cannot follow commands) + arm_weakness (1 if cannot hold arm 10 s); Katz 2015; max 4; severe_stroke_suggested if score ≥ 2",
  "max_score": 4,
  "score": 0,
  "arm_weakness": false,
  "gaze_deviation": 0,
  "loc_abnormal": false,
  "severe_stroke_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).
• 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).

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.