# ROSIER stroke recognition scale ROSIER Status: LIVE Price: $0.005 USDC `GET /api/calc/rosier` HTML: https://magentlab.com/docs/rosier Markdown: https://magentlab.com/docs/rosier.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum the seven Nor 2005 ROSIER items from caller-assigned flags and return whether the score is greater than 0 (stroke more likely). ## When to use When an agent already has ROSIER items assigned as present or absent and needs the published −2 to +5 total and the Nor 2005 score > 0 discriminator, not a stroke diagnosis and not NIHSS. ## When not to use - Not a medical device. Not a stroke diagnosis. magent does not examine the patient. - Each item is a caller-assigned boolean. magent does not collect a time of onset. - Stroke is more likely when the score is greater than 0 (Nor 2005). A score of 0 or less does not exclude stroke. - This is the Nor 2005 seven-item ROSIER instrument only. magent does not map ROSIER to NIHSS. ## Formula ``` ROSIER = -1*loss_of_consciousness_or_syncope - 1*seizure + 1*asymmetric_face_weakness + 1*asymmetric_arm_weakness + 1*asymmetric_leg_weakness + 1*speech_disturbance + 1*visual_field_defect; range -2 to 5; stroke_more_likely iff score > 0 (Nor 2005) ``` ## Citation [The Recognition of Stroke in the Emergency Room (ROSIER) scale: development and validation of a stroke recognition instrument](https://doi.org/10.1016/S1474-4422(05)70201-5) Nor AM, Davis J, Sen B, et al Lancet Neurol. 2005;4(11):727-734 DOI: [10.1016/S1474-4422(05)70201-5](https://doi.org/10.1016/S1474-4422(05)70201-5) ## Worked example ### All seven flags false Given: `asymmetric_arm_weakness=false, asymmetric_face_weakness=false, asymmetric_leg_weakness=false, loss_of_consciousness_or_syncope=false, seizure=false, speech_disturbance=false, visual_field_defect=false` 1. History items (loss of consciousness or syncope, seizure) false → 0 each 2. Five new acute-onset findings false → 0 each 3. Score = 0 (max 5); stroke_more_likely false because score is not > 0 ### All five acute findings true Given: `asymmetric_arm_weakness=true, asymmetric_face_weakness=true, asymmetric_leg_weakness=true, loss_of_consciousness_or_syncope=false, seizure=false, speech_disturbance=true, visual_field_defect=true` 1. History items false → 0 each 2. Face, arm, and leg weakness, speech disturbance, and visual field defect true → +1 each 3. Score = 5 (max 5); stroke_more_likely true because score > 0 ## Also searched as - ROSIER scale - Recognition of Stroke in the Emergency Room - Nor ROSIER - ROSIER stroke score - emergency room stroke recognition - ROSIER 2005 - Nor 2005 ROSIER ## Parameters - `loss_of_consciousness_or_syncope` (boolean, required): History of loss of consciousness or syncope (Nor 2005, −1 if true). true or false as assigned by the caller. magent does not examine the patient or collect a time of onset. - `seizure` (boolean, required): History of seizure activity (Nor 2005, −1 if true). true or false as assigned by the caller. magent does not examine the patient. - `asymmetric_face_weakness` (boolean, required): New acute-onset (or on awakening) asymmetric facial weakness (Nor 2005, +1 if true). true or false as assigned by the caller. magent does not examine the patient. - `asymmetric_arm_weakness` (boolean, required): New acute-onset (or on awakening) asymmetric arm weakness (Nor 2005, +1 if true). true or false as assigned by the caller. magent does not examine the patient. - `asymmetric_leg_weakness` (boolean, required): New acute-onset (or on awakening) asymmetric leg weakness (Nor 2005, +1 if true). true or false as assigned by the caller. magent does not examine the patient. - `speech_disturbance` (boolean, required): New acute-onset (or on awakening) speech disturbance (Nor 2005, +1 if true). true or false as assigned by the caller. magent does not examine the patient. - `visual_field_defect` (boolean, required): New acute-onset (or on awakening) visual field defect (Nor 2005, +1 if true). true or false as assigned by the caller. 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/rosier` 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": [ { "asymmetric_arm_weakness": "false", "asymmetric_face_weakness": "false", "asymmetric_leg_weakness": "false", "loss_of_consciousness_or_syncope": "false", "seizure": "false", "speech_disturbance": "false", "visual_field_defect": "false" }, { "asymmetric_arm_weakness": "false", "asymmetric_face_weakness": "false", "asymmetric_leg_weakness": "false", "loss_of_consciousness_or_syncope": "false", "seizure": "false", "speech_disturbance": "false", "visual_field_defect": "false" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/rosier Example 200: ```json { "count": 2, "path": "/api/calc/rosier", "items": [ { "components": [ { "factor": "loss_of_consciousness_or_syncope", "points": 0, "present": false }, { "factor": "seizure", "points": 0, "present": false }, { "factor": "asymmetric_face_weakness", "points": 0, "present": false }, { "factor": "asymmetric_arm_weakness", "points": 0, "present": false }, { "factor": "asymmetric_leg_weakness", "points": 0, "present": false }, { "factor": "speech_disturbance", "points": 0, "present": false }, { "factor": "visual_field_defect", "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": "Nor AM, Davis J, Sen B, et al", "doi": "10.1016/S1474-4422(05)70201-5", "id": "nor-2005", "pmid": "16239179", "source": "Lancet Neurol. 2005;4(11):727-734", "title": "The Recognition of Stroke in the Emergency Room (ROSIER) scale: development and validation of a stroke recognition instrument" }, "formula": "rosier", "formula_expression": "ROSIER = -1*loss_of_consciousness_or_syncope - 1*seizure + 1*asymmetric_face_weakness + 1*asymmetric_arm_weakness + 1*asymmetric_leg_weakness + 1*speech_disturbance + 1*visual_field_defect; range -2 to 5; stroke_more_likely iff score > 0 (Nor 2005)", "max_score": 5, "score": 0, "stroke_more_likely": false }, { "components": [ { "factor": "loss_of_consciousness_or_syncope", "points": 0, "present": false }, { "factor": "seizure", "points": 0, "present": false }, { "factor": "asymmetric_face_weakness", "points": 0, "present": false }, { "factor": "asymmetric_arm_weakness", "points": 0, "present": false }, { "factor": "asymmetric_leg_weakness", "points": 0, "present": false }, { "factor": "speech_disturbance", "points": 0, "present": false }, { "factor": "visual_field_defect", "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": "Nor AM, Davis J, Sen B, et al", "doi": "10.1016/S1474-4422(05)70201-5", "id": "nor-2005", "pmid": "16239179", "source": "Lancet Neurol. 2005;4(11):727-734", "title": "The Recognition of Stroke in the Emergency Room (ROSIER) scale: development and validation of a stroke recognition instrument" }, "formula": "rosier", "formula_expression": "ROSIER = -1*loss_of_consciousness_or_syncope - 1*seizure + 1*asymmetric_face_weakness + 1*asymmetric_arm_weakness + 1*asymmetric_leg_weakness + 1*speech_disturbance + 1*visual_field_defect; range -2 to 5; stroke_more_likely iff score > 0 (Nor 2005)", "max_score": 5, "score": 0, "stroke_more_likely": false } ] } ``` ## Response fields - `formula` (string): rosier - `formula_expression` (string): Exact expression used - `score` (integer): ROSIER points -2 to 5 (Nor 2005) - `max_score` (integer): 5 - `stroke_more_likely` (boolean): true iff score > 0 (Nor 2005). Score ≤ 0 does not exclude stroke. Not a diagnosis. - `components` (array): Per-item points - `citation` (object): Nor et al. Lancet Neurol 2005 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "factor": "loss_of_consciousness_or_syncope", "points": 0, "present": false }, { "factor": "seizure", "points": 0, "present": false }, { "factor": "asymmetric_face_weakness", "points": 0, "present": false }, { "factor": "asymmetric_arm_weakness", "points": 0, "present": false }, { "factor": "asymmetric_leg_weakness", "points": 0, "present": false }, { "factor": "speech_disturbance", "points": 0, "present": false }, { "factor": "visual_field_defect", "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": "Nor AM, Davis J, Sen B, et al", "doi": "10.1016/S1474-4422(05)70201-5", "id": "nor-2005", "pmid": "16239179", "source": "Lancet Neurol. 2005;4(11):727-734", "title": "The Recognition of Stroke in the Emergency Room (ROSIER) scale: development and validation of a stroke recognition instrument" }, "formula": "rosier", "formula_expression": "ROSIER = -1*loss_of_consciousness_or_syncope - 1*seizure + 1*asymmetric_face_weakness + 1*asymmetric_arm_weakness + 1*asymmetric_leg_weakness + 1*speech_disturbance + 1*visual_field_defect; range -2 to 5; stroke_more_likely iff score > 0 (Nor 2005)", "max_score": 5, "score": 0, "stroke_more_likely": false } ``` ## Errors - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged. - HTTP 400 `invalid_rosier`: each ROSIER 2005 item must be true or false as assigned by the caller. 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 - [LAMS](https://magentlab.com/docs/lams) — Sum Llanes 2004 LAMS points from caller-assigned facial droop, arm drift, and grip (LAPSS motor items). ## 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.