Neurology · LIVE

FAST-ED scale (Lima)

FAST-ED

Sum Lima 2016 Field Assessment Stroke Triage for Emergency Destination (FAST-ED) points from caller-assigned facial palsy, arm weakness, speech, eye deviation, and neglect, and return whether the total suggests large-vessel occlusion (score ≥4) plus the published LVO-rate band.

LIVE $0.005 USDC GET /api/calc/fast_ed

Markdown: /docs/fast-ed.md · Canonical: https://magentlab.com/docs/fast-ed

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

What it computes

Sum Lima 2016 Field Assessment Stroke Triage for Emergency Destination (FAST-ED) points from caller-assigned facial palsy, arm weakness, speech, eye deviation, and neglect, and return whether the total suggests large-vessel occlusion (score ≥4) plus the published LVO-rate band.

When to use

When an agent has caller-assigned Lima 2016 FAST-ED field items and needs the published 0-9 total, score ≥4 LVO flag, and 0_to_1 / 2_to_3 / gte_4 band, not a stroke diagnosis, transfer order, or NIHSS total.

When not to use

• Not a medical device. magent does not examine the patient. Facial palsy, arm weakness, speech, eye deviation, and neglect are caller-assigned Lima 2016 FAST-ED integers (Table 1).
• Not a stroke diagnosis and not a transfer or thrombolysis order.
• This is the published FAST-ED field scale, not NIHSS. magent does not compute NIHSS.
• Time from last known well is documented for decision making (0 points) and is not a scoring parameter.
• lvo_suggested is true iff score ≥ 4 (this paper's abstract threshold). fast_ed_band is the published LVO-rate grouping only (0-1 <15%, 2-3 ~30%, ≥4 ~60%+). Sensitivity, PPV, and a patient-level LVO probability are not returned.

Formula

FAST-ED = facial_palsy (0 normal or minor, 1 partial or complete) + arm_weakness (0 no drift, 1 drift or some effort against gravity, 2 no effort against gravity or no movement) + speech (0 absent, 1 mild to moderate, 2 severe, global aphasia, or mute) + eye_deviation (0 absent, 1 partial, 2 forced) + neglect (0 absent, 1 extinction to bilateral stimulation in only one sensory modality, 2 does not recognize own hand or orients only to one side); Lima 2016 Table 1; Time documented for decision making (0 points, not scored); max 9; lvo_suggested if score ≥ 4; fast_ed_band 0_to_1 (score 0–1, <15% LVO), 2_to_3 (score 2–3, ~30%), gte_4 (score ≥4, ~60%+)

Citation

Title

Field Assessment Stroke Triage for Emergency Destination: A Simple and Accurate Prehospital Scale to Detect Large Vessel Occlusion Strokes

Authors

Lima FO, Silva GS, Furie KL, et al.

Source

Stroke. 2016;47(8):1997-2002

DOI

10.1161/STROKEAHA.116.013301

Worked example

Also searched as

• FAST-ED
• FAST ED scale
• Field Assessment Stroke Triage
• Lima FAST-ED
• Field Assessment Stroke Triage for Emergency Destination
• prehospital LVO scale
• FAST-ED stroke scale
• FASTED

Try

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

/api/calc/fast_ed?facial_palsy=0&arm_weakness=0&speech=0&eye_deviation=0&neglect=0

Full URL: https://api.magentlab.com/api/calc/fast_ed?facial_palsy=0&arm_weakness=0&speech=0&eye_deviation=0&neglect=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/fast_ed?facial_palsy=0&arm_weakness=0&speech=0&eye_deviation=0&neglect=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/fast_ed 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_weakness": "0",
      "eye_deviation": "0",
      "facial_palsy": "0",
      "neglect": "0",
      "speech": "0"
    },
    {
      "arm_weakness": "0",
      "eye_deviation": "0",
      "facial_palsy": "0",
      "neglect": "0",
      "speech": "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/fast_ed",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_weakness",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "speech",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "eye_deviation",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "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": "Lima FO, Silva GS, Furie KL, et al.",
        "doi": "10.1161/STROKEAHA.116.013301",
        "id": "lima-2016",
        "pmid": "27364531",
        "source": "Stroke. 2016;47(8):1997-2002",
        "title": "Field Assessment Stroke Triage for Emergency Destination: A Simple and Accurate Prehospital Scale to Detect Large Vessel Occlusion Strokes"
      },
      "formula": "fast_ed",
      "formula_expression": "FAST-ED = facial_palsy (0 normal or minor, 1 partial or complete) + arm_weakness (0 no drift, 1 drift or some effort against gravity, 2 no effort against gravity or no movement) + speech (0 absent, 1 mild to moderate, 2 severe, global aphasia, or mute) + eye_deviation (0 absent, 1 partial, 2 forced) + neglect (0 absent, 1 extinction to bilateral stimulation in only one sensory modality, 2 does not recognize own hand or orients only to one side); Lima 2016 Table 1; Time documented for decision making (0 points, not scored); max 9; lvo_suggested if score ≥ 4; fast_ed_band 0_to_1 (score 0–1, <15% LVO), 2_to_3 (score 2–3, ~30%), gte_4 (score ≥4, ~60%+)",
      "max_score": 9,
      "score": 0,
      "arm_weakness": 0,
      "eye_deviation": 0,
      "facial_palsy": 0,
      "fast_ed_band": "0_to_1",
      "lvo_suggested": false,
      "neglect": 0,
      "speech": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "arm_weakness",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "speech",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "eye_deviation",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "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": "Lima FO, Silva GS, Furie KL, et al.",
        "doi": "10.1161/STROKEAHA.116.013301",
        "id": "lima-2016",
        "pmid": "27364531",
        "source": "Stroke. 2016;47(8):1997-2002",
        "title": "Field Assessment Stroke Triage for Emergency Destination: A Simple and Accurate Prehospital Scale to Detect Large Vessel Occlusion Strokes"
      },
      "formula": "fast_ed",
      "formula_expression": "FAST-ED = facial_palsy (0 normal or minor, 1 partial or complete) + arm_weakness (0 no drift, 1 drift or some effort against gravity, 2 no effort against gravity or no movement) + speech (0 absent, 1 mild to moderate, 2 severe, global aphasia, or mute) + eye_deviation (0 absent, 1 partial, 2 forced) + neglect (0 absent, 1 extinction to bilateral stimulation in only one sensory modality, 2 does not recognize own hand or orients only to one side); Lima 2016 Table 1; Time documented for decision making (0 points, not scored); max 9; lvo_suggested if score ≥ 4; fast_ed_band 0_to_1 (score 0–1, <15% LVO), 2_to_3 (score 2–3, ~30%), gte_4 (score ≥4, ~60%+)",
      "max_score": 9,
      "score": 0,
      "arm_weakness": 0,
      "eye_deviation": 0,
      "facial_palsy": 0,
      "fast_ed_band": "0_to_1",
      "lvo_suggested": false,
      "neglect": 0,
      "speech": 0
    }
  ]
}

Response

Example JSON

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

{
  "components": [
    {
      "value": 0,
      "factor": "facial_palsy",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "arm_weakness",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "speech",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "eye_deviation",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "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": "Lima FO, Silva GS, Furie KL, et al.",
    "doi": "10.1161/STROKEAHA.116.013301",
    "id": "lima-2016",
    "pmid": "27364531",
    "source": "Stroke. 2016;47(8):1997-2002",
    "title": "Field Assessment Stroke Triage for Emergency Destination: A Simple and Accurate Prehospital Scale to Detect Large Vessel Occlusion Strokes"
  },
  "formula": "fast_ed",
  "formula_expression": "FAST-ED = facial_palsy (0 normal or minor, 1 partial or complete) + arm_weakness (0 no drift, 1 drift or some effort against gravity, 2 no effort against gravity or no movement) + speech (0 absent, 1 mild to moderate, 2 severe, global aphasia, or mute) + eye_deviation (0 absent, 1 partial, 2 forced) + neglect (0 absent, 1 extinction to bilateral stimulation in only one sensory modality, 2 does not recognize own hand or orients only to one side); Lima 2016 Table 1; Time documented for decision making (0 points, not scored); max 9; lvo_suggested if score ≥ 4; fast_ed_band 0_to_1 (score 0–1, <15% LVO), 2_to_3 (score 2–3, ~30%), gte_4 (score ≥4, ~60%+)",
  "max_score": 9,
  "score": 0,
  "arm_weakness": 0,
  "eye_deviation": 0,
  "facial_palsy": 0,
  "fast_ed_band": "0_to_1",
  "lvo_suggested": false,
  "neglect": 0,
  "speech": 0
}

Client errors (HTTP 400)

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

Related tools

• RACE scale — Sum Pérez de la Ossa 2014 Rapid Arterial oCclusion Evaluation (RACE) scale points from caller-assigned facial palsy, arm motor, leg motor, head and gaze deviation, and cortical signs (aphasia if right hemiparesis, agnosia if left) and return whether the total suggests large arterial occlusion (score ≥5).
• CP-SSS — Sum Katz 2015 Cincinnati Prehospital Stroke Severity Scale (CP-SSS) points from caller-assigned conjugate gaze deviation, abnormal level of consciousness, and arm weakness, and return whether the total suggests severe stroke (score ≥2).
• LAMS — Sum Llanes 2004 LAMS points from caller-assigned facial droop, arm drift, and grip (LAPSS motor items).
• ROSIER — Sum the seven Nor 2005 ROSIER items from caller-assigned flags and return whether the score is greater than 0 (stroke more likely).

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.