Neurology · LIVE

Hunt and Hess SAH grade (1968)

Hunt-Hess

Return the Hunt and Hess 1968 subarachnoid-hemorrhage surgical-risk grade from a caller-assigned grade 1-5, applying the paper's next-less-favorable bump when serious systemic disease is present.

LIVE $0.005 USDC GET /api/calc/hunt_hess

Markdown: /docs/hunt-hess.md · Canonical: https://magentlab.com/docs/hunt-hess

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

What it computes

Return the Hunt and Hess 1968 subarachnoid-hemorrhage surgical-risk grade from a caller-assigned grade 1-5, applying the paper's next-less-favorable bump when serious systemic disease is present.

When to use

When an agent needs the 1968 Hunt and Hess grade (including the systemic-disease increment) and must not invent WFNS, grade 0, or grade 1a.

When not to use

• Not a diagnosis and not a surgical indication. magent does not examine the patient.
• This is Hunt and Hess 1968 grades 1-5 only. It does not implement Hunt and Kosnik 1974 grade 0 or 1a.
• Serious systemic disease (as assigned by the caller) increments the grade by 1, capped at 5, as published in 1968.

Formula

assigned_grade = min(5, grade + 1) if serious_systemic_disease, else grade; Hunt and Hess 1968 grades 1-5

Citation

Title

Surgical risk as related to time of intervention in the repair of intracranial aneurysms

Authors

Hunt WE, Hess RM

Source

J Neurosurg. 1968;28(1):14-20

DOI

10.3171/jns.1968.28.1.0014

Worked example

Also searched as

• Hunt Hess
• Hunt and Hess scale
• SAH grade
• subarachnoid hemorrhage grade
• Hunt Hess 1968
• aneurysm surgical risk grade

Try

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

/api/calc/hunt_hess?grade=2&serious_systemic_disease=false

Full URL: https://api.magentlab.com/api/calc/hunt_hess?grade=2&serious_systemic_disease=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/hunt_hess?grade=2&serious_systemic_disease=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/hunt_hess 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": [
    {
      "grade": "2",
      "serious_systemic_disease": "false"
    },
    {
      "grade": "2",
      "serious_systemic_disease": "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/hunt_hess",
  "items": [
    {
      "description": "Moderate to severe headache, nuchal rigidity, no neurologic deficit other than cranial nerve palsy",
      "components": [
        {
          "factor": "assigned_grade",
          "points": 2,
          "present": true
        }
      ],
      "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": "Hunt WE, Hess RM",
        "doi": "10.3171/jns.1968.28.1.0014",
        "id": "hunt-hess-1968",
        "source": "J Neurosurg. 1968;28(1):14-20",
        "title": "Surgical risk as related to time of intervention in the repair of intracranial aneurysms"
      },
      "formula": "hunt_hess",
      "formula_expression": "assigned_grade = min(5, grade + 1) if serious_systemic_disease, else grade; Hunt and Hess 1968 grades 1-5",
      "max_score": 5,
      "score": 2,
      "grade": 2,
      "input_grade": 2,
      "serious_systemic_disease": false
    },
    {
      "description": "Moderate to severe headache, nuchal rigidity, no neurologic deficit other than cranial nerve palsy",
      "components": [
        {
          "factor": "assigned_grade",
          "points": 2,
          "present": true
        }
      ],
      "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": "Hunt WE, Hess RM",
        "doi": "10.3171/jns.1968.28.1.0014",
        "id": "hunt-hess-1968",
        "source": "J Neurosurg. 1968;28(1):14-20",
        "title": "Surgical risk as related to time of intervention in the repair of intracranial aneurysms"
      },
      "formula": "hunt_hess",
      "formula_expression": "assigned_grade = min(5, grade + 1) if serious_systemic_disease, else grade; Hunt and Hess 1968 grades 1-5",
      "max_score": 5,
      "score": 2,
      "grade": 2,
      "input_grade": 2,
      "serious_systemic_disease": false
    }
  ]
}

Response

Example JSON

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

{
  "description": "Moderate to severe headache, nuchal rigidity, no neurologic deficit other than cranial nerve palsy",
  "components": [
    {
      "factor": "assigned_grade",
      "points": 2,
      "present": true
    }
  ],
  "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": "Hunt WE, Hess RM",
    "doi": "10.3171/jns.1968.28.1.0014",
    "id": "hunt-hess-1968",
    "source": "J Neurosurg. 1968;28(1):14-20",
    "title": "Surgical risk as related to time of intervention in the repair of intracranial aneurysms"
  },
  "formula": "hunt_hess",
  "formula_expression": "assigned_grade = min(5, grade + 1) if serious_systemic_disease, else grade; Hunt and Hess 1968 grades 1-5",
  "max_score": 5,
  "score": 2,
  "grade": 2,
  "input_grade": 2,
  "serious_systemic_disease": false
}

Client errors (HTTP 400)

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

Related tools

• Ottawa SAH Rule — Apply the Perry 2013 Ottawa SAH Rule and return whether investigation is indicated from age and five caller-assigned high-risk findings.
• ICH Score — Compute the Hemphill 2001 ICH Score from caller-assigned GCS, age, infratentorial origin, ICH volume, and IVH.
• 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

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.