Injury Severity Score (ISS)

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.

LIVE $0.005 USDC GET /api/calc/iss

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

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

What it computes

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.

When to use

When an agent needs the published Baker 1974 ISS total and must not invent AIS grades or substitute NISS.

When not to use

Not a triage order, disposition, or trauma-activation decision.
AIS grades are caller-assigned integers 0-6. magent does not assign AIS from an injury list or chart narrative.
Baker 1974 ISS only: the three most severely injured body regions. Not NISS, which squares the three worst injuries regardless of region.

Formula

ISS = a^2 + b^2 + c^2 for the three highest AIS body-region grades (0-5); any AIS 6 => 75

Citation

Title: The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care
Authors: Baker SP, O'Neill B, Haddon W Jr, Long WB
Source: J Trauma. 1974;14(3):187-196
DOI: 10.1097/00005373-197403000-00001

Worked example

Head 3, chest 2, abdomen 1

Given: ais_abdomen=1ais_chest=2ais_external=0ais_extremity=0ais_face=0ais_head=3

Three highest AIS: 3, 2, 1
ISS = 3^2 + 2^2 + 1^2 = 9 + 4 + 1 = 14

AIS 6 head is unsurvivable 75

Given: ais_abdomen=0ais_chest=0ais_external=0ais_extremity=0ais_face=0ais_head=6

Any AIS 6 → ISS = 75

Also searched as

injury severity score
ISS trauma
Baker ISS
abbreviated injury scale ISS
polytrauma ISS
AIS ISS

Try

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

/api/calc/iss?ais_head=3&ais_face=0&ais_chest=2&ais_abdomen=1&ais_extremity=0&ais_external=0

Full URL: https://api.magentlab.com/api/calc/iss?ais_head=3&ais_face=0&ais_chest=2&ais_abdomen=1&ais_extremity=0&ais_external=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/iss?ais_head=3&ais_face=0&ais_chest=2&ais_abdomen=1&ais_extremity=0&ais_external=0"

Parameters

Name	Type	Required	Description
`ais_head`	integer	required	Caller-assigned AIS grade for the head or neck (integer 0-6). magent does not assign AIS from an injury list.
`ais_face`	integer	required	Caller-assigned AIS grade for the face (integer 0-6).
`ais_chest`	integer	required	Caller-assigned AIS grade for the chest (integer 0-6).
`ais_abdomen`	integer	required	Caller-assigned AIS grade for the abdomen or pelvic contents (integer 0-6).
`ais_extremity`	integer	required	Caller-assigned AIS grade for the extremities or pelvic girdle (integer 0-6).
`ais_external`	integer	required	Caller-assigned AIS grade for external (integer 0-6).

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/iss 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": [
    {
      "ais_abdomen": "1",
      "ais_chest": "2",
      "ais_external": "0",
      "ais_extremity": "0",
      "ais_face": "0",
      "ais_head": "3"
    },
    {
      "ais_abdomen": "1",
      "ais_chest": "2",
      "ais_external": "0",
      "ais_extremity": "0",
      "ais_face": "0",
      "ais_head": "3"
    }
  ]
}

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/iss",
  "items": [
    {
      "components": [
        {
          "factor": "ais_head",
          "points": 9,
          "present": true,
          "ais": 3
        },
        {
          "factor": "ais_face",
          "points": 0,
          "present": false,
          "ais": 0
        },
        {
          "factor": "ais_chest",
          "points": 4,
          "present": true,
          "ais": 2
        },
        {
          "factor": "ais_abdomen",
          "points": 1,
          "present": true,
          "ais": 1
        },
        {
          "factor": "ais_extremity",
          "points": 0,
          "present": false,
          "ais": 0
        },
        {
          "factor": "ais_external",
          "points": 0,
          "present": false,
          "ais": 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": "Baker SP, O'Neill B, Haddon W Jr, Long WB",
        "doi": "10.1097/00005373-197403000-00001",
        "id": "baker-1974",
        "source": "J Trauma. 1974;14(3):187-196",
        "title": "The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care"
      },
      "formula": "iss",
      "formula_expression": "ISS = a^2 + b^2 + c^2 for the three highest AIS body-region grades (0-5); any AIS 6 => 75",
      "max_score": 75,
      "score": 14,
      "ais_abdomen": 1,
      "ais_chest": 2,
      "ais_external": 0,
      "ais_extremity": 0,
      "ais_face": 0,
      "ais_head": 3,
      "used_ais": [
        3,
        2,
        1
      ]
    },
    {
      "components": [
        {
          "factor": "ais_head",
          "points": 9,
          "present": true,
          "ais": 3
        },
        {
          "factor": "ais_face",
          "points": 0,
          "present": false,
          "ais": 0
        },
        {
          "factor": "ais_chest",
          "points": 4,
          "present": true,
          "ais": 2
        },
        {
          "factor": "ais_abdomen",
          "points": 1,
          "present": true,
          "ais": 1
        },
        {
          "factor": "ais_extremity",
          "points": 0,
          "present": false,
          "ais": 0
        },
        {
          "factor": "ais_external",
          "points": 0,
          "present": false,
          "ais": 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": "Baker SP, O'Neill B, Haddon W Jr, Long WB",
        "doi": "10.1097/00005373-197403000-00001",
        "id": "baker-1974",
        "source": "J Trauma. 1974;14(3):187-196",
        "title": "The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care"
      },
      "formula": "iss",
      "formula_expression": "ISS = a^2 + b^2 + c^2 for the three highest AIS body-region grades (0-5); any AIS 6 => 75",
      "max_score": 75,
      "score": 14,
      "ais_abdomen": 1,
      "ais_chest": 2,
      "ais_external": 0,
      "ais_extremity": 0,
      "ais_face": 0,
      "ais_head": 3,
      "used_ais": [
        3,
        2,
        1
      ]
    }
  ]
}

Response

Field	Type	Description
`formula`	string	iss
`formula_expression`	string	Exact expression used
`score`	integer	ISS 0-75
`max_score`	integer	75
`ais_head`	integer	Caller-assigned AIS head/neck 0-6
`ais_face`	integer	Caller-assigned AIS face 0-6
`ais_chest`	integer	Caller-assigned AIS chest 0-6
`ais_abdomen`	integer	Caller-assigned AIS abdomen/pelvic contents 0-6
`ais_extremity`	integer	Caller-assigned AIS extremities/pelvic girdle 0-6
`ais_external`	integer	Caller-assigned AIS external 0-6
`used_ais`	array	The three highest AIS grades used for the sum of squares (descending)
`components`	array	Per-region AIS and AIS squared
`citation`	object	Baker et al. J Trauma 1974 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "ais_head",
      "points": 9,
      "present": true,
      "ais": 3
    },
    {
      "factor": "ais_face",
      "points": 0,
      "present": false,
      "ais": 0
    },
    {
      "factor": "ais_chest",
      "points": 4,
      "present": true,
      "ais": 2
    },
    {
      "factor": "ais_abdomen",
      "points": 1,
      "present": true,
      "ais": 1
    },
    {
      "factor": "ais_extremity",
      "points": 0,
      "present": false,
      "ais": 0
    },
    {
      "factor": "ais_external",
      "points": 0,
      "present": false,
      "ais": 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": "Baker SP, O'Neill B, Haddon W Jr, Long WB",
    "doi": "10.1097/00005373-197403000-00001",
    "id": "baker-1974",
    "source": "J Trauma. 1974;14(3):187-196",
    "title": "The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care"
  },
  "formula": "iss",
  "formula_expression": "ISS = a^2 + b^2 + c^2 for the three highest AIS body-region grades (0-5); any AIS 6 => 75",
  "max_score": 75,
  "score": 14,
  "ais_abdomen": 1,
  "ais_chest": 2,
  "ais_external": 0,
  "ais_extremity": 0,
  "ais_face": 0,
  "ais_head": 3,
  "used_ais": [
    3,
    2,
    1
  ]
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_ais`	ais_head, ais_face, ais_chest, ais_abdomen, ais_extremity, and ais_external must each be an integer from 0 to 6. 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

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.
ABCD2 score — Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes.
RTS — Compute Champion 1989 coded GCS, SBP, and respiratory-rate values, the triage T-RTS sum, and the weighted RTS used for outcome evaluation.

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.
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.