AUDIT-C

Sum three caller-assigned Bush 1998 AUDIT-C integers (0-4) and return this paper's ≥3 and ≥4 screens.

LIVE $0.005 USDC GET /api/calc/audit_c

Markdown: /docs/audit-c.md · Canonical: https://magentlab.com/docs/audit-c

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

What it computes

Sum three caller-assigned Bush 1998 AUDIT-C integers (0-4) and return this paper's ≥3 and ≥4 screens.

When to use

When an agent has already applied the Bush 1998 response tables and needs the published AUDIT-C total plus ≥3/≥4 screens, not later sex-specific cutoffs or the full 10-item AUDIT.

When not to use

Not a diagnosis of alcohol use disorder.
frequency, typical_drinks, and binge_frequency are caller-assigned integers 0-4 using Bush 1998 response tables. magent does not map drink-count categories.
Thresholds are this paper's ≥3 (sensitive) and ≥4 (more specific) for heavy drinking / active abuse or dependence in VA outpatients (mostly men). magent does not apply later men≥4 / women≥3 VA-primary-care cutoffs.
Not the full 10-item AUDIT and not CIWA-Ar.

Formula

AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12

Citation

Title: The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking
Authors: Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA
Source: Arch Intern Med. 1998;158(16):1789-1795
DOI: 10.1001/archinte.158.16.1789

Worked example

All items 0

Given: binge_frequency=0frequency=0typical_drinks=0

frequency 0 + typical_drinks 0 + binge_frequency 0
Score = 0

1 + 1 + 1

Given: binge_frequency=1frequency=1typical_drinks=1

Score = 3
screen_ge_3 true; screen_ge_4 false

2 + 1 + 1

Given: binge_frequency=1frequency=2typical_drinks=1

Score = 4
screen_ge_3 true; screen_ge_4 true

Also searched as

AUDIT-C
AUDIT C
alcohol use disorders identification test consumption
Bush AUDIT-C
AUDIT consumption questions
brief AUDIT
AUDIT-C score

Try

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

/api/calc/audit_c?frequency=0&typical_drinks=0&binge_frequency=0

Full URL: https://api.magentlab.com/api/calc/audit_c?frequency=0&typical_drinks=0&binge_frequency=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/audit_c?frequency=0&typical_drinks=0&binge_frequency=0"

Parameters

Name	Type	Required	Description
`frequency`	integer	required	Caller-assigned Bush 1998 AUDIT item 1 points (integer 0-4): how often the patient had a drink containing alcohol in the past year. magent does not map drink-count categories.
`typical_drinks`	integer	required	Caller-assigned Bush 1998 AUDIT item 2 points (integer 0-4): how many drinks on a typical drinking day. magent does not map drink-count categories.
`binge_frequency`	integer	required	Caller-assigned Bush 1998 AUDIT item 3 points (integer 0-4): how often six or more drinks on one occasion. magent does not map drink-count categories.

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/audit_c 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": [
    {
      "binge_frequency": "0",
      "frequency": "0",
      "typical_drinks": "0"
    },
    {
      "binge_frequency": "0",
      "frequency": "0",
      "typical_drinks": "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/audit_c",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "typical_drinks",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "binge_frequency",
          "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": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
        "doi": "10.1001/archinte.158.16.1789",
        "id": "bush-1998",
        "source": "Arch Intern Med. 1998;158(16):1789-1795",
        "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
      },
      "formula": "audit_c",
      "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
      "max_score": 12,
      "score": 0,
      "screen_ge_3": false,
      "screen_ge_4": false
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "frequency",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "typical_drinks",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "binge_frequency",
          "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": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
        "doi": "10.1001/archinte.158.16.1789",
        "id": "bush-1998",
        "source": "Arch Intern Med. 1998;158(16):1789-1795",
        "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
      },
      "formula": "audit_c",
      "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
      "max_score": 12,
      "score": 0,
      "screen_ge_3": false,
      "screen_ge_4": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	audit_c
`formula_expression`	string	Exact expression used
`score`	integer	AUDIT-C points 0-12
`max_score`	integer	12
`screen_ge_3`	boolean	true iff score ≥ 3 (Bush 1998 sensitive threshold for heavy drinking / active abuse or dependence). Not a diagnosis.
`screen_ge_4`	boolean	true iff score ≥ 4 (Bush 1998 more specific threshold). Not later sex-specific cutoffs.
`components`	array	Per-item caller-assigned points
`citation`	object	Bush et al. Arch Intern Med 1998 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "frequency",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "typical_drinks",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "binge_frequency",
      "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": "Bush K, Kivlahan DR, McDonell MB, Fihn SD, Bradley KA",
    "doi": "10.1001/archinte.158.16.1789",
    "id": "bush-1998",
    "source": "Arch Intern Med. 1998;158(16):1789-1795",
    "title": "The AUDIT alcohol consumption questions (AUDIT-C): an effective brief screening test for problem drinking"
  },
  "formula": "audit_c",
  "formula_expression": "AUDIT-C = frequency + typical_drinks + binge_frequency; each caller-assigned 0-4; max 12",
  "max_score": 12,
  "score": 0,
  "screen_ge_3": false,
  "screen_ge_4": false
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_audit_c_item`	frequency, typical_drinks, and binge_frequency must each be an integer from 0 to 4 (caller-assigned Bush 1998 points). 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

CAGE — Sum the four Ewing 1984 CAGE items and return whether two or more answers are affirmative.
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.