Pediatric NIH Stroke Scale

PedNIHSS

Sum Ichord 2011 PedNIHSS points from 15 caller-assigned NINDS NIH Stroke Scale integers, with left and right motor arm and leg. Does not apply total-score severity bands.

LIVE $0.005 USDC GET /api/calc/pediatric_nihss

Markdown: /docs/pediatric-nihss.md · Canonical: https://magentlab.com/docs/pediatric-nihss

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

What it computes

Sum Ichord 2011 PedNIHSS points from 15 caller-assigned NINDS NIH Stroke Scale integers, with left and right motor arm and leg. Does not apply total-score severity bands.

When to use

When an agent already has Ichord 2011 PedNIHSS integers and needs that published total. magent does not examine the child, score Brott 1989 15-item NIHSS, score mNIHSS, or issue a tPA order.

When not to use

Not a medical device. magent does not examine the child. Each item is a caller-assigned Ichord 2011 / NINDS integer. Not a diagnosis.
This is the Ichord 2011 pediatric adaptation of the NINDS NIH Stroke Scale: all examination items and scoring ranges retained, with left and right motor arm and leg (each 0-4) and visual 0-3. It is not the Brott 1989 15-item NIHSS (weaker-limb motor, pupillary response, plantar reflex, max 37). Not mNIHSS. Not a tPA order.
Ichord 2011 published no total-score mild/moderate/severe cutoffs. This tool returns score and max_score only. It does not apply later 5/15/20 website cuts.

Formula

PedNIHSS = loc (0-3) + loc_questions (0-2) + loc_commands (0-2) + best_gaze (0-2) + best_visual (0-3) + facial_palsy (0-3) + motor_left_arm (0-4) + motor_right_arm (0-4) + motor_left_leg (0-4) + motor_right_leg (0-4) + limb_ataxia (0-2) + sensory (0-2) + best_language (0-3) + dysarthria (0-2) + extinction (0-2); Ichord 2011 pediatric adaptation of the NINDS NIHSS item list and scoring ranges (L/R motor; no pupillary response or plantar reflex); total = sum; max 42; no published total-score severity bands

Citation

Title: Interrater Reliability of the Pediatric National Institutes of Health Stroke Scale (PedNIHSS) in a Multicenter Study
Authors: Ichord RN, Bastian R, Abraham L, et al.
Source: Stroke. 2011;42(3):613-617
DOI: 10.1161/STROKEAHA.110.607192

Worked example

All items at published minimum

Given: best_gaze=0best_language=0best_visual=0dysarthria=0extinction=0facial_palsy=0limb_ataxia=0loc=0loc_commands=0loc_questions=0motor_left_arm=0motor_left_leg=0motor_right_arm=0motor_right_leg=0sensory=0

loc, loc_questions, loc_commands, best_gaze, best_visual, facial_palsy, motor_left_arm, motor_right_arm, motor_left_leg, motor_right_leg, limb_ataxia, sensory, best_language, dysarthria, and extinction are 0 as assigned by the caller
Score = 0 (max 42). Ichord 2011 published no total-score severity band.

All items at published maximum

Given: best_gaze=2best_language=3best_visual=3dysarthria=2extinction=2facial_palsy=3limb_ataxia=2loc=3loc_commands=2loc_questions=2motor_left_arm=4motor_left_leg=4motor_right_arm=4motor_right_leg=4sensory=2

each Ichord 2011 PedNIHSS item is at that paper's published NINDS maximum as assigned by the caller
Score = 42 (max 42). No total-score severity band.

Also searched as

Pediatric NIH Stroke Scale
PedNIHSS
Ichord 2011 PedNIHSS
Pediatric National Institutes of Health Stroke Scale
pediatric NIHSS
Ped NIHSS
childhood NIH stroke scale
NINDS pediatric NIHSS

Try

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

/api/calc/pediatric_nihss?loc=0&loc_questions=0&loc_commands=0&best_gaze=0&best_visual=0&facial_palsy=0&motor_left_arm=0&motor_right_arm=0&motor_left_leg=0&motor_right_leg=0&limb_ataxia=0&sensory=0&best_language=0&dysarthria=0&extinction=0

Full URL: https://api.magentlab.com/api/calc/pediatric_nihss?loc=0&loc_questions=0&loc_commands=0&best_gaze=0&best_visual=0&facial_palsy=0&motor_left_arm=0&motor_right_arm=0&motor_left_leg=0&motor_right_leg=0&limb_ataxia=0&sensory=0&best_language=0&dysarthria=0&extinction=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/pediatric_nihss?loc=0&loc_questions=0&loc_commands=0&best_gaze=0&best_visual=0&facial_palsy=0&motor_left_arm=0&motor_right_arm=0&motor_left_leg=0&motor_right_leg=0&limb_ataxia=0&sensory=0&best_language=0&dysarthria=0&extinction=0"

Parameters

Name	Type	Required	Description
`loc`	integer	required · 0, 1, 2, 3	Caller-assigned Ichord 2011 PedNIHSS level of consciousness (integer 0-3): 0 alert, 1 not alert but arousable, 2 not alert requires repeated stimulation, 3 unresponsive. magent does not examine the child.
`loc_questions`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS LOC questions (integer 0-2): 0 answers both correctly, 1 answers one correctly, 2 incorrect. magent does not examine the child.
`loc_commands`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS LOC commands (integer 0-2): 0 obeys both correctly, 1 obeys one correctly, 2 incorrect. magent does not examine the child.
`best_gaze`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS best gaze (integer 0-2): 0 normal, 1 partial gaze palsy, 2 forced deviation. magent does not examine the child.
`best_visual`	integer	required · 0, 1, 2, 3	Caller-assigned Ichord 2011 PedNIHSS best visual, NINDS range (integer 0-3): 0 no visual loss, 1 partial hemianopia, 2 complete hemianopia, 3 bilateral hemianopia. Not Brott 0-2. magent does not examine the child.
`facial_palsy`	integer	required · 0, 1, 2, 3	Caller-assigned Ichord 2011 PedNIHSS facial palsy (integer 0-3): 0 normal, 1 minor, 2 partial, 3 complete. magent does not examine the child.
`motor_left_arm`	integer	required · 0, 1, 2, 3, 4	Caller-assigned Ichord 2011 PedNIHSS left arm motor, NINDS style (integer 0-4): 0 no drift, 1 drift, 2 some effort against gravity, 3 no effort against gravity, 4 no movement. Not Brott weaker-limb. magent does not examine the child.
`motor_right_arm`	integer	required · 0, 1, 2, 3, 4	Caller-assigned Ichord 2011 PedNIHSS right arm motor, NINDS style (integer 0-4): 0 no drift, 1 drift, 2 some effort against gravity, 3 no effort against gravity, 4 no movement. Not Brott weaker-limb. magent does not examine the child.
`motor_left_leg`	integer	required · 0, 1, 2, 3, 4	Caller-assigned Ichord 2011 PedNIHSS left leg motor, NINDS style (integer 0-4): 0 no drift, 1 drift, 2 some effort against gravity, 3 no effort against gravity, 4 no movement. Not Brott weaker-limb. magent does not examine the child.
`motor_right_leg`	integer	required · 0, 1, 2, 3, 4	Caller-assigned Ichord 2011 PedNIHSS right leg motor, NINDS style (integer 0-4): 0 no drift, 1 drift, 2 some effort against gravity, 3 no effort against gravity, 4 no movement. Not Brott weaker-limb. magent does not examine the child.
`limb_ataxia`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS limb ataxia (integer 0-2): 0 absent, 1 present in one limb, 2 present in two limbs. magent does not examine the child.
`sensory`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS sensory (integer 0-2): 0 normal, 1 mild to moderate loss, 2 severe to total loss. magent does not examine the child.
`best_language`	integer	required · 0, 1, 2, 3	Caller-assigned Ichord 2011 PedNIHSS best language (integer 0-3): 0 no aphasia, 1 mild to moderate, 2 severe aphasia, 3 mute or global aphasia. magent does not examine the child.
`dysarthria`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS dysarthria (integer 0-2): 0 normal articulation, 1 mild to moderate, 2 severe or unintelligible. magent does not examine the child.
`extinction`	integer	required · 0, 1, 2	Caller-assigned Ichord 2011 PedNIHSS extinction and inattention (integer 0-2): 0 no abnormality, 1 inattention to one modality, 2 profound hemi-inattention or extinction to more than one modality. Not Brott neglect. magent does not examine 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/pediatric_nihss 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": [
    {
      "best_gaze": "0",
      "best_language": "0",
      "best_visual": "0",
      "dysarthria": "0",
      "extinction": "0",
      "facial_palsy": "0",
      "limb_ataxia": "0",
      "loc": "0",
      "loc_commands": "0",
      "loc_questions": "0",
      "motor_left_arm": "0",
      "motor_left_leg": "0",
      "motor_right_arm": "0",
      "motor_right_leg": "0",
      "sensory": "0"
    },
    {
      "best_gaze": "0",
      "best_language": "0",
      "best_visual": "0",
      "dysarthria": "0",
      "extinction": "0",
      "facial_palsy": "0",
      "limb_ataxia": "0",
      "loc": "0",
      "loc_commands": "0",
      "loc_questions": "0",
      "motor_left_arm": "0",
      "motor_left_leg": "0",
      "motor_right_arm": "0",
      "motor_right_leg": "0",
      "sensory": "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/pediatric_nihss",
  "items": [
    {
      "components": [
        {
          "value": 0,
          "factor": "loc",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "loc_questions",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "loc_commands",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_gaze",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_visual",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_left_arm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_right_arm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_left_leg",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_right_leg",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "limb_ataxia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sensory",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_language",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "dysarthria",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "extinction",
          "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": "Ichord RN, Bastian R, Abraham L, et al.",
        "doi": "10.1161/STROKEAHA.110.607192",
        "id": "ichord-2011",
        "pmid": "21317270",
        "source": "Stroke. 2011;42(3):613-617",
        "title": "Interrater Reliability of the Pediatric National Institutes of Health Stroke Scale (PedNIHSS) in a Multicenter Study"
      },
      "formula": "pediatric_nihss",
      "formula_expression": "PedNIHSS = loc (0-3) + loc_questions (0-2) + loc_commands (0-2) + best_gaze (0-2) + best_visual (0-3) + facial_palsy (0-3) + motor_left_arm (0-4) + motor_right_arm (0-4) + motor_left_leg (0-4) + motor_right_leg (0-4) + limb_ataxia (0-2) + sensory (0-2) + best_language (0-3) + dysarthria (0-2) + extinction (0-2); Ichord 2011 pediatric adaptation of the NINDS NIHSS item list and scoring ranges (L/R motor; no pupillary response or plantar reflex); total = sum; max 42; no published total-score severity bands",
      "max_score": 42,
      "score": 0
    },
    {
      "components": [
        {
          "value": 0,
          "factor": "loc",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "loc_questions",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "loc_commands",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_gaze",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_visual",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "facial_palsy",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_left_arm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_right_arm",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_left_leg",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "motor_right_leg",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "limb_ataxia",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "sensory",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "best_language",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "dysarthria",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "extinction",
          "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": "Ichord RN, Bastian R, Abraham L, et al.",
        "doi": "10.1161/STROKEAHA.110.607192",
        "id": "ichord-2011",
        "pmid": "21317270",
        "source": "Stroke. 2011;42(3):613-617",
        "title": "Interrater Reliability of the Pediatric National Institutes of Health Stroke Scale (PedNIHSS) in a Multicenter Study"
      },
      "formula": "pediatric_nihss",
      "formula_expression": "PedNIHSS = loc (0-3) + loc_questions (0-2) + loc_commands (0-2) + best_gaze (0-2) + best_visual (0-3) + facial_palsy (0-3) + motor_left_arm (0-4) + motor_right_arm (0-4) + motor_left_leg (0-4) + motor_right_leg (0-4) + limb_ataxia (0-2) + sensory (0-2) + best_language (0-3) + dysarthria (0-2) + extinction (0-2); Ichord 2011 pediatric adaptation of the NINDS NIHSS item list and scoring ranges (L/R motor; no pupillary response or plantar reflex); total = sum; max 42; no published total-score severity bands",
      "max_score": 42,
      "score": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	pediatric_nihss
`formula_expression`	string	Exact expression used
`score`	integer	Ichord 2011 PedNIHSS sum of 15 caller-assigned NINDS examination items (0-42)
`max_score`	integer	Always 42
`components`	array	Per-item caller-assigned points
`citation`	object	Ichord Stroke 2011 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": "loc",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "loc_questions",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "loc_commands",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "best_gaze",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "best_visual",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "facial_palsy",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "motor_left_arm",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "motor_right_arm",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "motor_left_leg",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "motor_right_leg",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "limb_ataxia",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "sensory",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "best_language",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "dysarthria",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "extinction",
      "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": "Ichord RN, Bastian R, Abraham L, et al.",
    "doi": "10.1161/STROKEAHA.110.607192",
    "id": "ichord-2011",
    "pmid": "21317270",
    "source": "Stroke. 2011;42(3):613-617",
    "title": "Interrater Reliability of the Pediatric National Institutes of Health Stroke Scale (PedNIHSS) in a Multicenter Study"
  },
  "formula": "pediatric_nihss",
  "formula_expression": "PedNIHSS = loc (0-3) + loc_questions (0-2) + loc_commands (0-2) + best_gaze (0-2) + best_visual (0-3) + facial_palsy (0-3) + motor_left_arm (0-4) + motor_right_arm (0-4) + motor_left_leg (0-4) + motor_right_leg (0-4) + limb_ataxia (0-2) + sensory (0-2) + best_language (0-3) + dysarthria (0-2) + extinction (0-2); Ichord 2011 pediatric adaptation of the NINDS NIHSS item list and scoring ranges (L/R motor; no pupillary response or plantar reflex); total = sum; max 42; no published total-score severity bands",
  "max_score": 42,
  "score": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_pediatric_nihss`	PedNIHSS needs Ichord pediatric NIH Stroke Scale item scores in published ranges. 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

NIHSS — Sum Brott 1989 NIH stroke scale points from 15 caller-assigned examination integers, including pupillary response and plantar reflex. Weaker-limb motor arm and leg. Does not apply later total-score severity bands.
mNIHSS — Sum Meyer/Lyden 2001 modified NIH stroke scale points from 11 caller-assigned NINDS-style examination integers, with left/right motor and sensory collapsed to 0-1. Does not apply total-score severity bands.

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.