PLAN score

PLAN

Compute the O'Donnell 2012 PLAN score (preadmission comorbidities, level of consciousness, age, and neurologic deficit) for death and severe disability after acute ischemic stroke from the published Table 4 items.

LIVE $0.005 USDC GET /api/calc/plan

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

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

What it computes

When to use

When an agent needs the published PLAN total and <10 / 10-15 / >15 grouping after acute ischemic stroke, and must not invent NIHSS-total points or iScore items from a chart narrative.

When not to use

Not a medical device and not a tPA decision.
This is the PLAN score (O'Donnell 2012), not iScore.
Derived in the Registry of the Canadian Stroke Network in patients 18 years or older with acute ischemic stroke. Thrombolysis, TIA, and intracerebral hemorrhage were excluded from the primary analysis. The paper reports lower discrimination after thrombolysis and in lacunar stroke.
The caller assigns published items (preadmission dependence, cancer, heart failure, atrial fibrillation, reduced level of consciousness, significant or total arm and leg weakness, aphasia or neglect). magent does not examine the patient.

Formula

PLAN = preadmission_dependence 1.5 + cancer 1.5 + congestive_heart_failure 1 + atrial_fibrillation 1 + reduced_loc 5 + min(floor(age/10), 10) + arm_weakness 2 + leg_weakness 2 + aphasia_or_neglect 1; O'Donnell 2012 Table 4; max 25; bands <10 / 10-15 / >15

Citation

Title: The PLAN score: a bedside prediction rule for death and severe disability following acute ischemic stroke
Authors: O'Donnell MJ, Fang J, D'Uva C, et al.
Source: Arch Intern Med. 2012;172(20):1548-1556
DOI: 10.1001/2013.jamainternmed.30

Worked example

Age 18, all Table 4 items absent

Given: age=18aphasia_or_neglect=falsearm_weakness=falseatrial_fibrillation=falsecancer=falsecongestive_heart_failure=falseleg_weakness=falsepreadmission_dependence=falsereduced_loc=false

Age 18 → 1 point per decade (floor 18/10 = 1), maximum 10
Preadmission dependence, cancer, heart failure, and atrial fibrillation absent → 0
Alert; no significant/total arm or leg weakness; no aphasia or neglect → 0
Score = 1 (max 25); plan_band <10

Also searched as

PLAN score
O'Donnell PLAN
preadmission comorbidities LOC age deficit
PLAN ischemic stroke
PLAN 2012
death severe disability after stroke PLAN
reduced level of consciousness PLAN

Try

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

/api/calc/plan?age=18&preadmission_dependence=false&cancer=false&congestive_heart_failure=false&atrial_fibrillation=false&reduced_loc=false&arm_weakness=false&leg_weakness=false&aphasia_or_neglect=false

Full URL: https://api.magentlab.com/api/calc/plan?age=18&preadmission_dependence=false&cancer=false&congestive_heart_failure=false&atrial_fibrillation=false&reduced_loc=false&arm_weakness=false&leg_weakness=false&aphasia_or_neglect=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/plan?age=18&preadmission_dependence=false&cancer=false&congestive_heart_failure=false&atrial_fibrillation=false&reduced_loc=false&arm_weakness=false&leg_weakness=false&aphasia_or_neglect=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years (18-120). O'Donnell 2012 Table 4: 1 point per decade (floor age/10), maximum 10. The derivation excluded patients younger than 18.
`preadmission_dependence`	boolean	required	Preadmission dependence (O'Donnell 2012 Table 4). true scores 1.5; false scores 0. The caller assigns the item.
`cancer`	boolean	required	History of cancer on the admission notes (O'Donnell 2012 Table 4; not a diagnosis made during the incident hospitalization). true scores 1.5; false scores 0. The caller assigns the item.
`congestive_heart_failure`	boolean	required	Congestive heart failure (O'Donnell 2012 Table 4). true scores 1; false scores 0. The caller assigns the item.
`atrial_fibrillation`	boolean	required	Atrial fibrillation (O'Donnell 2012 Table 4). true scores 1; false scores 0. The caller assigns the item.
`reduced_loc`	boolean	required	Caller-assigned reduced level of consciousness (O'Donnell 2012 Table 4). true scores 5; false (alert) scores 0. magent does not examine the patient.
`arm_weakness`	boolean	required	Caller-assigned significant or total arm weakness (O'Donnell 2012 Table 4). true scores 2. Mild or no weakness scores 0. magent does not examine the patient.
`leg_weakness`	boolean	required	Caller-assigned significant or total leg weakness (O'Donnell 2012 Table 4). true scores 2. Mild or no weakness scores 0. magent does not examine the patient.
`aphasia_or_neglect`	boolean	required	Caller-assigned aphasia or neglect (O'Donnell 2012 Table 4 combined item). true scores 1 whether one or both are present; false scores 0. magent does not examine the patient.

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/plan 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": [
    {
      "age": "18",
      "aphasia_or_neglect": "false",
      "arm_weakness": "false",
      "atrial_fibrillation": "false",
      "cancer": "false",
      "congestive_heart_failure": "false",
      "leg_weakness": "false",
      "preadmission_dependence": "false",
      "reduced_loc": "false"
    },
    {
      "age": "18",
      "aphasia_or_neglect": "false",
      "arm_weakness": "false",
      "atrial_fibrillation": "false",
      "cancer": "false",
      "congestive_heart_failure": "false",
      "leg_weakness": "false",
      "preadmission_dependence": "false",
      "reduced_loc": "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/plan",
  "items": [
    {
      "components": [
        {
          "value": 18,
          "factor": "age",
          "points": 1,
          "present": true
        },
        {
          "factor": "preadmission_dependence",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "cancer",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "atrial_fibrillation",
          "points": 0,
          "present": false
        },
        {
          "factor": "reduced_loc",
          "points": 0,
          "present": false
        },
        {
          "factor": "arm_weakness",
          "points": 0,
          "present": false
        },
        {
          "factor": "leg_weakness",
          "points": 0,
          "present": false
        },
        {
          "factor": "aphasia_or_neglect",
          "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": "O'Donnell MJ, Fang J, D'Uva C, et al.",
        "doi": "10.1001/2013.jamainternmed.30",
        "id": "odonnell-2012",
        "pmid": "23147454",
        "source": "Arch Intern Med. 2012;172(20):1548-1556",
        "title": "The PLAN score: a bedside prediction rule for death and severe disability following acute ischemic stroke"
      },
      "formula": "plan",
      "formula_expression": "PLAN = preadmission_dependence 1.5 + cancer 1.5 + congestive_heart_failure 1 + atrial_fibrillation 1 + reduced_loc 5 + min(floor(age/10), 10) + arm_weakness 2 + leg_weakness 2 + aphasia_or_neglect 1; O'Donnell 2012 Table 4; max 25; bands <10 / 10-15 / >15",
      "age_years": 18,
      "max_score": 25,
      "score": 1.0,
      "age_points": 1,
      "plan_band": "<10"
    },
    {
      "components": [
        {
          "value": 18,
          "factor": "age",
          "points": 1,
          "present": true
        },
        {
          "factor": "preadmission_dependence",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "cancer",
          "points": 0.0,
          "present": false
        },
        {
          "factor": "congestive_heart_failure",
          "points": 0,
          "present": false
        },
        {
          "factor": "atrial_fibrillation",
          "points": 0,
          "present": false
        },
        {
          "factor": "reduced_loc",
          "points": 0,
          "present": false
        },
        {
          "factor": "arm_weakness",
          "points": 0,
          "present": false
        },
        {
          "factor": "leg_weakness",
          "points": 0,
          "present": false
        },
        {
          "factor": "aphasia_or_neglect",
          "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": "O'Donnell MJ, Fang J, D'Uva C, et al.",
        "doi": "10.1001/2013.jamainternmed.30",
        "id": "odonnell-2012",
        "pmid": "23147454",
        "source": "Arch Intern Med. 2012;172(20):1548-1556",
        "title": "The PLAN score: a bedside prediction rule for death and severe disability following acute ischemic stroke"
      },
      "formula": "plan",
      "formula_expression": "PLAN = preadmission_dependence 1.5 + cancer 1.5 + congestive_heart_failure 1 + atrial_fibrillation 1 + reduced_loc 5 + min(floor(age/10), 10) + arm_weakness 2 + leg_weakness 2 + aphasia_or_neglect 1; O'Donnell 2012 Table 4; max 25; bands <10 / 10-15 / >15",
      "age_years": 18,
      "max_score": 25,
      "score": 1.0,
      "age_points": 1,
      "plan_band": "<10"
    }
  ]
}

Response

Field	Type	Description
`formula`	string	plan
`formula_expression`	string	Exact expression used
`score`	number	PLAN points 1-25 (half-points from dependence and cancer)
`max_score`	integer	Always 25
`plan_band`	string	O'Donnell 2012 Results grouping: <10, 10-15, or >15 (death or severe disability strata). Not a mortality percent.
`age_years`	integer	Age used for 1 point per decade
`age_points`	integer	min(floor(age/10), 10) from O'Donnell 2012 Table 4
`components`	array	Per-factor points
`citation`	object	O'Donnell 2012 Arch Intern Med citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "value": 18,
      "factor": "age",
      "points": 1,
      "present": true
    },
    {
      "factor": "preadmission_dependence",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "cancer",
      "points": 0.0,
      "present": false
    },
    {
      "factor": "congestive_heart_failure",
      "points": 0,
      "present": false
    },
    {
      "factor": "atrial_fibrillation",
      "points": 0,
      "present": false
    },
    {
      "factor": "reduced_loc",
      "points": 0,
      "present": false
    },
    {
      "factor": "arm_weakness",
      "points": 0,
      "present": false
    },
    {
      "factor": "leg_weakness",
      "points": 0,
      "present": false
    },
    {
      "factor": "aphasia_or_neglect",
      "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": "O'Donnell MJ, Fang J, D'Uva C, et al.",
    "doi": "10.1001/2013.jamainternmed.30",
    "id": "odonnell-2012",
    "pmid": "23147454",
    "source": "Arch Intern Med. 2012;172(20):1548-1556",
    "title": "The PLAN score: a bedside prediction rule for death and severe disability following acute ischemic stroke"
  },
  "formula": "plan",
  "formula_expression": "PLAN = preadmission_dependence 1.5 + cancer 1.5 + congestive_heart_failure 1 + atrial_fibrillation 1 + reduced_loc 5 + min(floor(age/10), 10) + arm_weakness 2 + leg_weakness 2 + aphasia_or_neglect 1; O'Donnell 2012 Table 4; max 25; bands <10 / 10-15 / >15",
  "age_years": 18,
  "max_score": 25,
  "score": 1.0,
  "age_points": 1,
  "plan_band": "<10"
}

Client errors (HTTP 400)

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

HTTP	Code	When
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_plan`	each PLAN 2012 stroke item must be a published value. 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

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ABCD2 score — Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes.

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.