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ICH Score

Compute the Hemphill 2001 ICH Score from caller-assigned GCS, age, infratentorial origin, ICH volume, and IVH.

Also searched as

ICH Score
Hemphill ICH Score
intracerebral hemorrhage score
ICH grading scale
Hemphill 2001 ICH
ICH volume IVH score
intraventricular hemorrhage ICH Score

LIVE $0.005 USDC GET /api/calc/ich_score

Markdown: /docs/ich-score.md · Canonical: https://magentlab.com/docs/ich-score

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

What it computes

Compute the Hemphill 2001 ICH Score from caller-assigned GCS, age, infratentorial origin, ICH volume, and IVH.

When to use

When an agent needs the published five-item ICH Score total and must not invent GCS, volume, IVH, or origin from a CT scan.

When not to use

Not a diagnosis and not a withdrawal-of-care protocol.
The caller assigns GCS, ICH volume, IVH, and infratentorial origin. magent does not read a CT scan.
This is the Hemphill 2001 ICH Score, not the FUNC score and not ICH-GS.
The response is a point total (max 6). It does not include a 30-day mortality percentage table.

Formula

ICH Score = gcs + age_ge_80 + infratentorial_origin + ich_volume_ge_30_ml + ivh; GCS 3-4 → 2, 5-12 → 1, 13-15 → 0; age >=80 1; infratentorial origin 1; volume >=30 mL 1; IVH 1; max 6

Citation

Title: The ICH Score: a simple, reliable grading scale for intracerebral hemorrhage
Authors: Hemphill JC 3rd, Bonovich DC, Besmertis L, Manley GT, Johnston SC
Source: Stroke. 2001;32(4):891-897
DOI: 10.1161/01.STR.32.4.891

Worked example

All items absent

Given: age=70gcs=15ich_volume_ml=10infratentorial_origin=falseivh=false

GCS 15 → 0; age 70 is not ≥80 → 0; infratentorial origin false → 0
Volume 10 mL is not ≥30 → 0; IVH false → 0
Score = 0 (max 6)

All five items at maximum

Given: age=80gcs=3ich_volume_ml=30infratentorial_origin=trueivh=true

GCS 3 → 2; age 80 ≥ 80 → 1; infratentorial origin true → 1
Volume 30 mL ≥ 30 → 1; IVH true → 1
Score = 6 (max 6)

Try

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

/api/calc/ich_score?gcs=15&age=70&infratentorial_origin=false&ich_volume_ml=10&ivh=false

Full URL: https://api.magentlab.com/api/calc/ich_score?gcs=15&age=70&infratentorial_origin=false&ich_volume_ml=10&ivh=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/ich_score?gcs=15&age=70&infratentorial_origin=false&ich_volume_ml=10&ivh=false"

Parameters

Name	Type	Required	Description
`gcs`	integer	required	Caller-assigned GCS total (integer 3-15). 3-4 scores 2; 5-12 scores 1; 13-15 scores 0. magent does not compute GCS from eye, verbal, and motor here.
`age`	integer	required	Age in years (18-120). ≥80 scores 1; 79 does not.
`infratentorial_origin`	boolean	required	Infratentorial origin of the hemorrhage as assigned by the caller. true or false. 1 point if true. magent does not read a CT scan.
`ich_volume_ml`	number	required	ICH volume in mL (cm^3 in Hemphill 2001). Number from 0.1 to 300. ≥30 scores 1; 29.9 does not. magent does not measure volume from imaging.
`ivh`	boolean	required	Intraventricular hemorrhage as assigned by the caller. true or false. 1 point if true. magent does not read a CT scan.

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/ich_score 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": [
    {
      "age": "70",
      "gcs": "15",
      "ich_volume_ml": "10",
      "infratentorial_origin": "false",
      "ivh": "false"
    },
    {
      "age": "70",
      "gcs": "15",
      "ich_volume_ml": "10",
      "infratentorial_origin": "false",
      "ivh": "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/ich_score",
  "items": [
    {
      "components": [
        {
          "value": 15,
          "factor": "gcs",
          "points": 0,
          "present": false
        },
        {
          "value": 70,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "infratentorial_origin",
          "points": 0,
          "present": false
        },
        {
          "value": 10.0,
          "factor": "ich_volume_ml",
          "points": 0,
          "present": false
        },
        {
          "factor": "ivh",
          "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": "Hemphill JC 3rd, Bonovich DC, Besmertis L, Manley GT, Johnston SC",
        "doi": "10.1161/01.STR.32.4.891",
        "id": "hemphill-2001",
        "source": "Stroke. 2001;32(4):891-897",
        "title": "The ICH Score: a simple, reliable grading scale for intracerebral hemorrhage"
      },
      "formula": "ich_score",
      "formula_expression": "ICH Score = gcs + age_ge_80 + infratentorial_origin + ich_volume_ge_30_ml + ivh; GCS 3-4 → 2, 5-12 → 1, 13-15 → 0; age >=80 1; infratentorial origin 1; volume >=30 mL 1; IVH 1; max 6",
      "max_score": 6,
      "score": 0,
      "age_years": 70,
      "gcs": 15,
      "ich_volume_ml": 10.0
    },
    {
      "components": [
        {
          "value": 15,
          "factor": "gcs",
          "points": 0,
          "present": false
        },
        {
          "value": 70,
          "factor": "age",
          "points": 0,
          "present": false
        },
        {
          "factor": "infratentorial_origin",
          "points": 0,
          "present": false
        },
        {
          "value": 10.0,
          "factor": "ich_volume_ml",
          "points": 0,
          "present": false
        },
        {
          "factor": "ivh",
          "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": "Hemphill JC 3rd, Bonovich DC, Besmertis L, Manley GT, Johnston SC",
        "doi": "10.1161/01.STR.32.4.891",
        "id": "hemphill-2001",
        "source": "Stroke. 2001;32(4):891-897",
        "title": "The ICH Score: a simple, reliable grading scale for intracerebral hemorrhage"
      },
      "formula": "ich_score",
      "formula_expression": "ICH Score = gcs + age_ge_80 + infratentorial_origin + ich_volume_ge_30_ml + ivh; GCS 3-4 → 2, 5-12 → 1, 13-15 → 0; age >=80 1; infratentorial origin 1; volume >=30 mL 1; IVH 1; max 6",
      "max_score": 6,
      "score": 0,
      "age_years": 70,
      "gcs": 15,
      "ich_volume_ml": 10.0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	ich_score
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-6
`max_score`	integer	Always 6
`gcs`	integer	Caller-assigned GCS total used for the 3-4 / 5-12 / 13-15 bands
`age_years`	integer	Age used for the ≥80 criterion
`ich_volume_ml`	number	ICH volume in mL used for the ≥30 criterion
`components`	array	Per-item points
`citation`	object	Hemphill 2001 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 15,
      "factor": "gcs",
      "points": 0,
      "present": false
    },
    {
      "value": 70,
      "factor": "age",
      "points": 0,
      "present": false
    },
    {
      "factor": "infratentorial_origin",
      "points": 0,
      "present": false
    },
    {
      "value": 10.0,
      "factor": "ich_volume_ml",
      "points": 0,
      "present": false
    },
    {
      "factor": "ivh",
      "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": "Hemphill JC 3rd, Bonovich DC, Besmertis L, Manley GT, Johnston SC",
    "doi": "10.1161/01.STR.32.4.891",
    "id": "hemphill-2001",
    "source": "Stroke. 2001;32(4):891-897",
    "title": "The ICH Score: a simple, reliable grading scale for intracerebral hemorrhage"
  },
  "formula": "ich_score",
  "formula_expression": "ICH Score = gcs + age_ge_80 + infratentorial_origin + ich_volume_ge_30_ml + ivh; GCS 3-4 → 2, 5-12 → 1, 13-15 → 0; age >=80 1; infratentorial origin 1; volume >=30 mL 1; IVH 1; max 6",
  "max_score": 6,
  "score": 0,
  "age_years": 70,
  "gcs": 15,
  "ich_volume_ml": 10.0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_gcs_total`	gcs must be an integer from 3 to 15. Returned before settlement; you are not charged.
400	`invalid_age`	age must be an integer from 18 to 120 Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false Returned before settlement; you are not charged.
400	`invalid_ich_volume`	ich_volume_ml must be a number from 0.1 to 300. 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.

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.