# Los Angeles Motor Scale (LAMS) LAMS Status: LIVE Price: $0.005 USDC `GET /api/calc/lams` HTML: https://magentlab.com/docs/lams Markdown: https://magentlab.com/docs/lams.md 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 [The Los Angeles Motor Scale (LAMS): a new measure to characterize stroke severity in the field](https://doi.org/10.1080/312703002806) Llanes JN, Kidwell CS, Starkman S, Leary MC, Eckstein M, Saver JL Prehosp Emerg Care. 2004;8(1):46-50 DOI: [10.1080/312703002806](https://doi.org/10.1080/312703002806) ## Worked example ### All motor items absent Given: `arm_drift=0, facial_droop=0, grip=0` 1. facial_droop 0 + arm_drift 0 + grip 0 2. Score = 0 (max 5) ### Present droop, rapid fall, no grip Given: `arm_drift=2, facial_droop=1, grip=2` 1. facial_droop 1 + arm_drift 2 + grip 2 2. Score = 5 (max 5) ## Also searched as - Los Angeles Motor Scale - LAMS - Llanes LAMS - LAPSS motor - Los Angeles Prehospital Stroke Screen motor - field stroke severity - LAMS score ## Parameters - `facial_droop` (integer, required): Llanes 2004 facial droop as assigned by the caller. 0 absent, 1 present. magent does not examine the patient. - `arm_drift` (integer, required): Llanes 2004 arm drift as assigned by the caller. 0 absent, 1 drifts down, 2 falls rapidly. magent does not examine the patient. - `grip` (integer, required): Llanes 2004 grip as assigned by the caller. 0 normal, 1 weak, 2 no grip. 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. Method: `POST /api/calc/lams` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: 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: ```json { "items": [ { "arm_drift": "0", "facial_droop": "0", "grip": "0" }, { "arm_drift": "0", "facial_droop": "0", "grip": "0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/lams Example 200: ```json { "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 fields - `formula` (string): lams - `formula_expression` (string): Exact expression used - `score` (integer): LAMS points 0-5 - `max_score` (integer): 5 - `facial_droop` (integer): Caller-assigned facial droop 0 or 1 - `arm_drift` (integer): Caller-assigned arm drift 0, 1, or 2 - `grip` (integer): Caller-assigned grip 0, 1, or 2 - `components` (array): Per-item points - `citation` (object): Llanes 2004 Prehosp Emerg Care citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "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 } ``` ## Errors - HTTP 400 `invalid_lams_face`: facial_droop must be 0 (absent) or 1 (present) (Llanes 2004 LAMS). Returned before settlement; you are not charged. - HTTP 400 `invalid_lams_arm`: arm_drift must be 0 (absent), 1 (drifts down), or 2 (falls rapidly) (Llanes 2004 LAMS). Returned before settlement; you are not charged. - HTTP 400 `invalid_lams_grip`: grip must be 0 (normal), 1 (weak), or 2 (no grip) (Llanes 2004 LAMS). Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [Glasgow Coma Scale](https://magentlab.com/docs/gcs) — 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](https://magentlab.com/docs/abcd2) — Compute the ABCD2 score as age, blood pressure, caller-assigned clinical features, symptom duration, and diabetes. - [Modified Rankin](https://magentlab.com/docs/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. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/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.