CAM-ICU

Apply the Ely 2001 CAM-ICU algorithm and return whether delirium is present from four caller-assigned features.

LIVE $0.005 USDC GET /api/calc/cam_icu

Markdown: /docs/cam-icu.md · Canonical: https://magentlab.com/docs/cam-icu

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

What it computes

Apply the Ely 2001 CAM-ICU algorithm and return whether delirium is present from four caller-assigned features.

When to use

When an agent already has the four CAM-ICU features assigned as in Ely 2001 (mechanically ventilated adults in the validation paper) and needs the published delirium present/absent result. magent does not administer RASS or the attention screening exam.

When not to use

Not a medical device.
Not a diagnosis. magent does not diagnose delirium.
The caller assigns the four CAM-ICU features as already determined. magent does not observe the patient.
magent does not administer RASS and does not run the attention screening exam.

Formula

delirium present iff Feature 1 AND Feature 2 AND (Feature 3 OR Feature 4)

Citation

Title: Delirium in mechanically ventilated patients: validity and reliability of the confusion assessment method for the intensive care unit (CAM-ICU)
Authors: Ely EW, Inouye SK, Bernard GR, et al.
Source: JAMA. 2001;286(21):2703-2710
DOI: 10.1001/jama.286.21.2703

Worked example

All four features absent

Given: acute_onset_or_fluctuation=falsealtered_level_of_consciousness=falsedisorganized_thinking=falseinattention=false

All four caller-assigned CAM-ICU features are false
Feature 1 and Feature 2 are absent; delirium is not present

Features 1, 2, and 4 present

Given: acute_onset_or_fluctuation=truealtered_level_of_consciousness=truedisorganized_thinking=falseinattention=true

Feature 1 and Feature 2 hold; Feature 4 holds; Feature 3 is absent
Delirium is present because Feature 3 or Feature 4 holds

Also searched as

CAM-ICU
Confusion Assessment Method ICU
Ely CAM-ICU
ICU delirium CAM
CAM for the intensive care unit
Confusion Assessment Method for the ICU
Ely 2001 CAM-ICU

Try

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

/api/calc/cam_icu?acute_onset_or_fluctuation=false&inattention=false&disorganized_thinking=false&altered_level_of_consciousness=false

Full URL: https://api.magentlab.com/api/calc/cam_icu?acute_onset_or_fluctuation=false&inattention=false&disorganized_thinking=false&altered_level_of_consciousness=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/cam_icu?acute_onset_or_fluctuation=false&inattention=false&disorganized_thinking=false&altered_level_of_consciousness=false"

Parameters

Name	Type	Required	Description
`acute_onset_or_fluctuation`	boolean	required	Feature 1: acute onset of mental status change or fluctuating course. true or false as assigned by the caller. magent does not observe the patient or judge fluctuation.
`inattention`	boolean	required	Feature 2: inattention. true or false as assigned by the caller. magent does not run the attention screening exam.
`disorganized_thinking`	boolean	required	Feature 3: disorganized thinking. true or false as assigned by the caller. magent does not administer the thinking questions.
`altered_level_of_consciousness`	boolean	required	Feature 4: altered level of consciousness. true or false as assigned by the caller. magent does not administer RASS.

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/cam_icu 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": [
    {
      "acute_onset_or_fluctuation": "false",
      "altered_level_of_consciousness": "false",
      "disorganized_thinking": "false",
      "inattention": "false"
    },
    {
      "acute_onset_or_fluctuation": "false",
      "altered_level_of_consciousness": "false",
      "disorganized_thinking": "false",
      "inattention": "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/cam_icu",
  "items": [
    {
      "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": "Ely EW, Inouye SK, Bernard GR, et al.",
        "doi": "10.1001/jama.286.21.2703",
        "id": "ely-2001",
        "pmid": "11730446",
        "source": "JAMA. 2001;286(21):2703-2710",
        "title": "Delirium in mechanically ventilated patients: validity and reliability of the confusion assessment method for the intensive care unit (CAM-ICU)"
      },
      "formula": "cam_icu",
      "formula_expression": "delirium present iff Feature 1 AND Feature 2 AND (Feature 3 OR Feature 4)",
      "criteria": [
        {
          "factor": "acute_onset_or_fluctuation",
          "met": false
        },
        {
          "factor": "inattention",
          "met": false
        },
        {
          "factor": "disorganized_thinking",
          "met": false
        },
        {
          "factor": "altered_level_of_consciousness",
          "met": false
        }
      ],
      "delirium_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": "Ely EW, Inouye SK, Bernard GR, et al.",
        "doi": "10.1001/jama.286.21.2703",
        "id": "ely-2001",
        "pmid": "11730446",
        "source": "JAMA. 2001;286(21):2703-2710",
        "title": "Delirium in mechanically ventilated patients: validity and reliability of the confusion assessment method for the intensive care unit (CAM-ICU)"
      },
      "formula": "cam_icu",
      "formula_expression": "delirium present iff Feature 1 AND Feature 2 AND (Feature 3 OR Feature 4)",
      "criteria": [
        {
          "factor": "acute_onset_or_fluctuation",
          "met": false
        },
        {
          "factor": "inattention",
          "met": false
        },
        {
          "factor": "disorganized_thinking",
          "met": false
        },
        {
          "factor": "altered_level_of_consciousness",
          "met": false
        }
      ],
      "delirium_present": false
    }
  ]
}

Response

Field	Type	Description
`formula`	string	cam_icu
`formula_expression`	string	Ely 2001: Feature 1 AND Feature 2 AND (Feature 3 OR Feature 4)
`delirium_present`	boolean	true only when Feature 1 and Feature 2 hold and Feature 3 or Feature 4 also holds. Not a diagnosis.
`criteria`	array	Per-feature rows with factor and met; met is true when that CAM-ICU feature is present
`citation`	object	Ely 2001 JAMA citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "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": "Ely EW, Inouye SK, Bernard GR, et al.",
    "doi": "10.1001/jama.286.21.2703",
    "id": "ely-2001",
    "pmid": "11730446",
    "source": "JAMA. 2001;286(21):2703-2710",
    "title": "Delirium in mechanically ventilated patients: validity and reliability of the confusion assessment method for the intensive care unit (CAM-ICU)"
  },
  "formula": "cam_icu",
  "formula_expression": "delirium present iff Feature 1 AND Feature 2 AND (Feature 3 OR Feature 4)",
  "criteria": [
    {
      "factor": "acute_onset_or_fluctuation",
      "met": false
    },
    {
      "factor": "inattention",
      "met": false
    },
    {
      "factor": "disorganized_thinking",
      "met": false
    },
    {
      "factor": "altered_level_of_consciousness",
      "met": false
    }
  ],
  "delirium_present": false
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_flag`	boolean clinical flags must be true or false 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.
FOUR score — Compute the FOUR score as the sum of caller-assigned eye, motor, brainstem, and respiration integers 0-4.

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.