Emergency · LIVE

H-Impairment Index (Hack)

HII

Return the Hack 2014 H-Impairment Index (sum of completed 0-4 task scores divided by 4 times the number of tasks completed).

LIVE $0.005 USDC GET /api/calc/hii

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

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

What it computes

Return the Hack 2014 H-Impairment Index (sum of completed 0-4 task scores divided by 4 times the number of tasks completed).

When to use

When an agent has already assigned Hack 2014 bedside-task integers and needs the published current HII, not a serial decline, discharge order, or legal sobriety decision.

When not to use

• Not a medical device. Not a diagnosis, discharge order, or legal sobriety test.
• Each of the five bedside tasks is a caller-assigned integer 0-4. magent does not examine the patient.
• Omitted tasks (not attempted) are excluded from both the numerator and the denominator. The denominator is 4 times the number of completed tasks, not always 20.
• Returns the current index only. Serial decline over time is not modeled.
• Does not take or echo a blood alcohol concentration.
• Hack 2014 published the index arithmetic only. magent does not apply later performance papers or invent impairment bands.

Formula

HII = (gross_motor + mentation_speech + tracing_curve + nystagmus + finger_to_nose) / (4 × tasks_completed); each completed task a caller-assigned integer 0-4; omitted tasks excluded from numerator and denominator; max denominator 20 if all five completed; range 0-1; current index only

Citation

Title

The H-Impairment Index (HII): a standardized assessment of alcohol-induced impairment in the Emergency Department

Authors

Hack JB, Goldlust EJ, Gibbs F, Zink BJ

Source

Am J Drug Alcohol Abuse. 2014;40(2):111-117

DOI

10.3109/00952990.2013.865034

Worked example

Also searched as

• H-Impairment Index
• Hack Impairment Index
• HII score
• alcohol impairment index
• Hack 2014 HII
• ED alcohol impairment

Try

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

/api/calc/hii?gross_motor=0&mentation_speech=0&tracing_curve=0&nystagmus=0&finger_to_nose=0

Full URL: https://api.magentlab.com/api/calc/hii?gross_motor=0&mentation_speech=0&tracing_curve=0&nystagmus=0&finger_to_nose=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/hii?gross_motor=0&mentation_speech=0&tracing_curve=0&nystagmus=0&finger_to_nose=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/hii 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": [
    {
      "finger_to_nose": "0",
      "gross_motor": "0",
      "mentation_speech": "0",
      "nystagmus": "0",
      "tracing_curve": "0"
    },
    {
      "finger_to_nose": "0",
      "gross_motor": "0",
      "mentation_speech": "0",
      "nystagmus": "0",
      "tracing_curve": "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/hii",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "gross_motor",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "mentation_speech",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "tracing_curve",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "nystagmus",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "finger_to_nose",
          "points": 0,
          "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": "Hack JB, Goldlust EJ, Gibbs F, Zink BJ",
        "doi": "10.3109/00952990.2013.865034",
        "id": "hack-2014",
        "pmid": "24555813",
        "source": "Am J Drug Alcohol Abuse. 2014;40(2):111-117",
        "title": "The H-Impairment Index (HII): a standardized assessment of alcohol-induced impairment in the Emergency Department"
      },
      "formula": "hii",
      "formula_expression": "HII = (gross_motor + mentation_speech + tracing_curve + nystagmus + finger_to_nose) / (4 × tasks_completed); each completed task a caller-assigned integer 0-4; omitted tasks excluded from numerator and denominator; max denominator 20 if all five completed; range 0-1; current index only",
      "max_score": 1,
      "score": 0.0,
      "max_points": 20,
      "task_sum": 0,
      "tasks_completed": 5
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "gross_motor",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "mentation_speech",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "tracing_curve",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "nystagmus",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "finger_to_nose",
          "points": 0,
          "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": "Hack JB, Goldlust EJ, Gibbs F, Zink BJ",
        "doi": "10.3109/00952990.2013.865034",
        "id": "hack-2014",
        "pmid": "24555813",
        "source": "Am J Drug Alcohol Abuse. 2014;40(2):111-117",
        "title": "The H-Impairment Index (HII): a standardized assessment of alcohol-induced impairment in the Emergency Department"
      },
      "formula": "hii",
      "formula_expression": "HII = (gross_motor + mentation_speech + tracing_curve + nystagmus + finger_to_nose) / (4 × tasks_completed); each completed task a caller-assigned integer 0-4; omitted tasks excluded from numerator and denominator; max denominator 20 if all five completed; range 0-1; current index only",
      "max_score": 1,
      "score": 0.0,
      "max_points": 20,
      "task_sum": 0,
      "tasks_completed": 5
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "gross_motor",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "mentation_speech",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "tracing_curve",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "nystagmus",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "finger_to_nose",
      "points": 0,
      "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": "Hack JB, Goldlust EJ, Gibbs F, Zink BJ",
    "doi": "10.3109/00952990.2013.865034",
    "id": "hack-2014",
    "pmid": "24555813",
    "source": "Am J Drug Alcohol Abuse. 2014;40(2):111-117",
    "title": "The H-Impairment Index (HII): a standardized assessment of alcohol-induced impairment in the Emergency Department"
  },
  "formula": "hii",
  "formula_expression": "HII = (gross_motor + mentation_speech + tracing_curve + nystagmus + finger_to_nose) / (4 × tasks_completed); each completed task a caller-assigned integer 0-4; omitted tasks excluded from numerator and denominator; max denominator 20 if all five completed; range 0-1; current index only",
  "max_score": 1,
  "score": 0.0,
  "max_points": 20,
  "task_sum": 0,
  "tasks_completed": 5
}

Client errors (HTTP 400)

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

Related tools

• CIWA-Ar — Sum the ten Sullivan 1989 CIWA-Ar items (nine caller-assigned 0-7 plus orientation 0-4) and return the published total (max 67).
• CAGE — Sum the four Ewing 1984 CAGE items and return whether two or more answers are affirmative.

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.