Neurology · LIVE

GCS-Pupils score

GCS-Pupils

Return the Brennan 2018 GCS-Pupils index as caller-assigned total GCS 3-15 minus pupil reactivity score (unreactive pupils 0, 1, or 2).

LIVE $0.005 USDC GET /api/calc/gcs_pupils

Markdown: /docs/gcs-pupils.md · Canonical: https://magentlab.com/docs/gcs-pupils

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

What it computes

Return the Brennan 2018 GCS-Pupils index as caller-assigned total GCS 3-15 minus pupil reactivity score (unreactive pupils 0, 1, or 2).

When to use

When an agent already has a 1976-style total GCS 3-15 and a pupil reactivity score (0-2) and needs the published GCS-P index, not eye/verbal/motor components and not Part 2 outcome charts.

When not to use

• Not a medical device and not a diagnosis of TBI severity as a device output.
• magent does not examine pupils or assign GCS. It uses caller-assigned total GCS 3-15 (1976-style total) minus PRS.
• Does not compute eye, verbal, or motor components (use /api/calc/gcs).
• Does not implement Brennan 2018 Part 2 probability charts. Returns the GCS-P index only.

Formula

GCS-P = GCS - PRS; PRS is the number of unreactive pupils (0, 1, or 2); GCS 3-15; GCS-P range 1-15 (Brennan 2018)

Citation

Title

Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score: an extended index of clinical severity

Authors

Brennan PM, Murray GD, Teasdale GM

Source

J Neurosurg. 2018;128(6):1612-1620

DOI

10.3171/2017.12.JNS172780

Worked example

Also searched as

• GCS-P
• GCS pupils
• pupil reactivity score
• GCS-Pupils score
• Brennan GCS-P
• unreactive pupils GCS
• GCS minus PRS
• pupil reactivity score GCS

Try

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

/api/calc/gcs_pupils?gcs=15&unreactive_pupils=0

Full URL: https://api.magentlab.com/api/calc/gcs_pupils?gcs=15&unreactive_pupils=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/gcs_pupils?gcs=15&unreactive_pupils=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/gcs_pupils 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": [
    {
      "gcs": "15",
      "unreactive_pupils": "0"
    },
    {
      "gcs": "15",
      "unreactive_pupils": "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/gcs_pupils",
  "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": "Brennan PM, Murray GD, Teasdale GM",
        "doi": "10.3171/2017.12.JNS172780",
        "id": "brennan-2018",
        "pmid": "29631516",
        "source": "J Neurosurg. 2018;128(6):1612-1620",
        "title": "Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score: an extended index of clinical severity"
      },
      "formula": "gcs_pupils",
      "formula_expression": "GCS-P = GCS - PRS; PRS is the number of unreactive pupils (0, 1, or 2); GCS 3-15; GCS-P range 1-15 (Brennan 2018)",
      "gcs": 15,
      "gcs_p": 15,
      "pupil_reactivity_score": 0
    },
    {
      "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": "Brennan PM, Murray GD, Teasdale GM",
        "doi": "10.3171/2017.12.JNS172780",
        "id": "brennan-2018",
        "pmid": "29631516",
        "source": "J Neurosurg. 2018;128(6):1612-1620",
        "title": "Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score: an extended index of clinical severity"
      },
      "formula": "gcs_pupils",
      "formula_expression": "GCS-P = GCS - PRS; PRS is the number of unreactive pupils (0, 1, or 2); GCS 3-15; GCS-P range 1-15 (Brennan 2018)",
      "gcs": 15,
      "gcs_p": 15,
      "pupil_reactivity_score": 0
    }
  ]
}

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": "Brennan PM, Murray GD, Teasdale GM",
    "doi": "10.3171/2017.12.JNS172780",
    "id": "brennan-2018",
    "pmid": "29631516",
    "source": "J Neurosurg. 2018;128(6):1612-1620",
    "title": "Simplifying the use of prognostic information in traumatic brain injury. Part 1: The GCS-Pupils score: an extended index of clinical severity"
  },
  "formula": "gcs_pupils",
  "formula_expression": "GCS-P = GCS - PRS; PRS is the number of unreactive pupils (0, 1, or 2); GCS 3-15; GCS-P range 1-15 (Brennan 2018)",
  "gcs": 15,
  "gcs_p": 15,
  "pupil_reactivity_score": 0
}

Client errors (HTTP 400)

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

Related tools

• Glasgow Coma Scale — Compute the Glasgow Coma Scale as the sum of caller-assigned eye, verbal, and motor integers. The 1974 or 1976 edition is required.
• FOUR score — Compute the FOUR score as the sum of caller-assigned eye, motor, brainstem, and respiration integers 0-4.

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.