Neurology · LIVE

Los Angeles Motor Scale (LAMS)

LAMS

Sum Llanes 2004 LAMS points from caller-assigned facial droop, arm drift, and grip (LAPSS motor items).

LIVE $0.005 USDC GET /api/calc/lams

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

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

What it computes

Sum Llanes 2004 LAMS points from caller-assigned facial droop, arm drift, and grip (LAPSS motor items).

When to use

When an agent needs the published Llanes 2004 field motor total and must not invent an LVO cutoff, NIHSS equivalent, or thrombolysis order.

When not to use

• Not a medical device. magent does not examine the patient. Facial droop, arm drift, and grip are caller-assigned Llanes 2004 integers.
• Not NIHSS. Not a stroke diagnosis or thrombolysis order.
• Llanes 2004 constructed LAMS by assigning those point values to LAPSS motor items (max 5). It does not define an LVO cutoff, risk class, or probability; those are later papers and are not returned.

Formula

LAMS = facial_droop (0 absent, 1 present) + arm_drift (0 absent, 1 drifts down, 2 falls rapidly) + grip (0 normal, 1 weak, 2 no grip); Llanes 2004 LAPSS motor items; max 5

Citation

Title

The Los Angeles Motor Scale (LAMS): a new measure to characterize stroke severity in the field

Authors

Llanes JN, Kidwell CS, Starkman S, Leary MC, Eckstein M, Saver JL

Source

Prehosp Emerg Care. 2004;8(1):46-50

DOI

10.1080/312703002806

Worked example

Also searched as

• Los Angeles Motor Scale
• LAMS
• Llanes LAMS
• LAPSS motor
• Los Angeles Prehospital Stroke Screen motor
• field stroke severity
• LAMS score

Try

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

/api/calc/lams?facial_droop=0&arm_drift=0&grip=0

Full URL: https://api.magentlab.com/api/calc/lams?facial_droop=0&arm_drift=0&grip=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/lams?facial_droop=0&arm_drift=0&grip=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/lams 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": [
    {
      "arm_drift": "0",
      "facial_droop": "0",
      "grip": "0"
    },
    {
      "arm_drift": "0",
      "facial_droop": "0",
      "grip": "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/lams",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_droop",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_drift",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "grip",
          "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": "Llanes JN, Kidwell CS, Starkman S, Leary MC, Eckstein M, Saver JL",
        "doi": "10.1080/312703002806",
        "id": "llanes-2004",
        "pmid": "14691787",
        "source": "Prehosp Emerg Care. 2004;8(1):46-50",
        "title": "The Los Angeles Motor Scale (LAMS): a new measure to characterize stroke severity in the field"
      },
      "formula": "lams",
      "formula_expression": "LAMS = facial_droop (0 absent, 1 present) + arm_drift (0 absent, 1 drifts down, 2 falls rapidly) + grip (0 normal, 1 weak, 2 no grip); Llanes 2004 LAPSS motor items; max 5",
      "max_score": 5,
      "score": 0,
      "arm_drift": 0,
      "facial_droop": 0,
      "grip": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_droop",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_drift",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "grip",
          "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": "Llanes JN, Kidwell CS, Starkman S, Leary MC, Eckstein M, Saver JL",
        "doi": "10.1080/312703002806",
        "id": "llanes-2004",
        "pmid": "14691787",
        "source": "Prehosp Emerg Care. 2004;8(1):46-50",
        "title": "The Los Angeles Motor Scale (LAMS): a new measure to characterize stroke severity in the field"
      },
      "formula": "lams",
      "formula_expression": "LAMS = facial_droop (0 absent, 1 present) + arm_drift (0 absent, 1 drifts down, 2 falls rapidly) + grip (0 normal, 1 weak, 2 no grip); Llanes 2004 LAPSS motor items; max 5",
      "max_score": 5,
      "score": 0,
      "arm_drift": 0,
      "facial_droop": 0,
      "grip": 0
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "facial_droop",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "arm_drift",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "grip",
      "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": "Llanes JN, Kidwell CS, Starkman S, Leary MC, Eckstein M, Saver JL",
    "doi": "10.1080/312703002806",
    "id": "llanes-2004",
    "pmid": "14691787",
    "source": "Prehosp Emerg Care. 2004;8(1):46-50",
    "title": "The Los Angeles Motor Scale (LAMS): a new measure to characterize stroke severity in the field"
  },
  "formula": "lams",
  "formula_expression": "LAMS = facial_droop (0 absent, 1 present) + arm_drift (0 absent, 1 drifts down, 2 falls rapidly) + grip (0 normal, 1 weak, 2 no grip); Llanes 2004 LAPSS motor items; max 5",
  "max_score": 5,
  "score": 0,
  "arm_drift": 0,
  "facial_droop": 0,
  "grip": 0
}

Client errors (HTTP 400)

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

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.
• ABCD2 score — Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes.
• Modified Rankin — Return the van Swieten 1988 modified Rankin handicap grade 0-5 from a caller-assigned integer, with the published grade wording.

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.