MAGENT

Neurology · LIVE

FLACC (Merkel)

FLACC

Sum five caller-assigned Merkel 1997 FLACC integers (0-2) and return the published total (max 10).

LIVE $0.005 USDC GET /api/calc/flacc

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

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

What it computes

Sum five caller-assigned Merkel 1997 FLACC integers (0-2) and return the published total (max 10).

When to use

When an agent has already assigned Merkel 1997 0-2 integers for face, legs, activity, cry, and consolability and needs the published total, not a pain diagnosis, analgesic order, or later intensity cutoff.

When not to use

  • Not a medical device and not a pain diagnosis or analgesic order.
  • Each of the five items is a caller-assigned integer 0, 1, or 2 from Merkel 1997. magent does not observe the child.
  • Merkel 1997 described postoperative pain scoring in children 2 months to 7 years. magent does not take an age parameter and does not restrict the caller.
  • Total is 0-10. magent does not add mild, moderate, or severe intensity cutoffs that are not in Merkel 1997.
  • Not PAINAD.

Formula

FLACC = face + legs + activity + cry + consolability; each caller-assigned 0-2; max 10

Citation

Title
The FLACC: a behavioral scale for scoring postoperative pain in young children
Authors
Merkel SI, Voepel-Lewis T, Shayevitz JR, Malviya S
Source
Pediatr Nurs. 1997;23(3):293-297
DOI
none

Worked example

All items 0

Given: activity=0consolability=0cry=0face=0legs=0

  1. face 0 + legs 0 + activity 0 + cry 0 + consolability 0
  2. Score = 0 (max 10)

All items 2

Given: activity=2consolability=2cry=2face=2legs=2

  1. face 2 + legs 2 + activity 2 + cry 2 + consolability 2
  2. Score = 10 (max 10)

Also searched as

  • FLACC
  • Face Legs Activity Cry Consolability
  • Merkel FLACC
  • FLACC scale
  • postoperative pain young children
  • Merkel 1997 FLACC
  • behavioral pain children

Try

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

/api/calc/flacc?face=0&legs=0&activity=0&cry=0&consolability=0

Full URL: https://api.magentlab.com/api/calc/flacc?face=0&legs=0&activity=0&cry=0&consolability=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/flacc?face=0&legs=0&activity=0&cry=0&consolability=0"

Parameters

Name Type Required Description
face integer required Caller-assigned Merkel 1997 FLACC face (integer 0-2): 0 no particular expression or smile; 1 occasional grimace/frown, withdrawn or disinterested; 2 frequent/constant quivering chin, clenched jaw. magent does not observe the child.
legs integer required Caller-assigned Merkel 1997 FLACC legs (integer 0-2): 0 normal position or relaxed; 1 uneasy, restless, tense; 2 kicking or legs drawn up. magent does not observe the child.
activity integer required Caller-assigned Merkel 1997 FLACC activity (integer 0-2): 0 lying quietly, normal position, moves easily; 1 squirming, shifting back and forth, tense; 2 arched, rigid or jerking. magent does not observe the child.
cry integer required Caller-assigned Merkel 1997 FLACC cry (integer 0-2): 0 no cry (awake or asleep); 1 moans or whimpers, occasional complaint; 2 crying steadily, screams or sobs, frequent complaints. magent does not observe the child.
consolability integer required Caller-assigned Merkel 1997 FLACC consolability (integer 0-2): 0 content and relaxed; 1 reassured by occasional touching, hugging or being talked to, distractible; 2 difficult to console or comfort. magent does not observe the child.

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/flacc 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": [
    {
      "activity": "0",
      "consolability": "0",
      "cry": "0",
      "face": "0",
      "legs": "0"
    },
    {
      "activity": "0",
      "consolability": "0",
      "cry": "0",
      "face": "0",
      "legs": "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/flacc",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "face",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "legs",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "activity",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "cry",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "consolability",
          "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": "Merkel SI, Voepel-Lewis T, Shayevitz JR, Malviya S",
        "id": "merkel-1997",
        "pmid": "9220806",
        "source": "Pediatr Nurs. 1997;23(3):293-297",
        "title": "The FLACC: a behavioral scale for scoring postoperative pain in young children"
      },
      "formula": "flacc",
      "formula_expression": "FLACC = face + legs + activity + cry + consolability; each caller-assigned 0-2; max 10",
      "max_score": 10,
      "score": 0,
      "activity": 0,
      "consolability": 0,
      "cry": 0,
      "face": 0,
      "legs": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "face",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "legs",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "activity",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "cry",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "consolability",
          "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": "Merkel SI, Voepel-Lewis T, Shayevitz JR, Malviya S",
        "id": "merkel-1997",
        "pmid": "9220806",
        "source": "Pediatr Nurs. 1997;23(3):293-297",
        "title": "The FLACC: a behavioral scale for scoring postoperative pain in young children"
      },
      "formula": "flacc",
      "formula_expression": "FLACC = face + legs + activity + cry + consolability; each caller-assigned 0-2; max 10",
      "max_score": 10,
      "score": 0,
      "activity": 0,
      "consolability": 0,
      "cry": 0,
      "face": 0,
      "legs": 0
    }
  ]
}

Response

Field Type Description
formula string flacc
formula_expression string Exact expression used
score integer FLACC points 0-10
max_score integer Always 10
face integer Caller-assigned face points 0-2
legs integer Caller-assigned legs points 0-2
activity integer Caller-assigned activity points 0-2
cry integer Caller-assigned cry points 0-2
consolability integer Caller-assigned consolability points 0-2
components array Per-item caller-assigned points
citation object Merkel et al. Pediatr Nurs 1997 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": "face",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "legs",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "activity",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "cry",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "consolability",
      "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": "Merkel SI, Voepel-Lewis T, Shayevitz JR, Malviya S",
    "id": "merkel-1997",
    "pmid": "9220806",
    "source": "Pediatr Nurs. 1997;23(3):293-297",
    "title": "The FLACC: a behavioral scale for scoring postoperative pain in young children"
  },
  "formula": "flacc",
  "formula_expression": "FLACC = face + legs + activity + cry + consolability; each caller-assigned 0-2; max 10",
  "max_score": 10,
  "score": 0,
  "activity": 0,
  "consolability": 0,
  "cry": 0,
  "face": 0,
  "legs": 0
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_flacc face, legs, activity, cry, and consolability must each be an integer 0, 1, or 2 (Merkel 1997). 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

  • PAINAD — Sum five caller-assigned Warden 2003 PAINAD integers (0-2) and return the published total (max 10).

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.