Emergency · LIVE

Infant scalp score

Return the Greenes 2001 infant scalp score as age points plus caller-assigned hematoma-size and hematoma-location points (total 0-8).

LIVE $0.005 USDC GET /api/calc/infant_scalp

Markdown: /docs/infant-scalp.md · Canonical: https://magentlab.com/docs/infant-scalp

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

What it computes

Return the Greenes 2001 infant scalp score as age points plus caller-assigned hematoma-size and hematoma-location points (total 0-8).

When to use

When an agent already has infant age in months and caller-assigned hematoma size and location points and needs the published 0-8 total. magent does not examine the scalp or decide CT.

When not to use

Not a medical device and not a CT order, imaging decision, or diagnosis of intracranial injury. magent does not decide CT and does not examine the infant.
Age is integer months 0-24 as in Greenes 2001 (infants 0-24 months). Age points: 0-2 months → 3; 3-5 → 2; 6-11 → 1; ≥12 → 0. magent does not convert years or days.
Hematoma size is caller-assigned 0-3 (none, small, medium, large). magent does not measure the hematoma or invent centimeter cuts.
Hematoma location is caller-assigned 0 frontal, 1 occipital, 2 temporal/parietal. magent does not examine the scalp.
Greenes 2001 total is 0-8. magent does not apply later PECARN or Schutzman 2020 ≥4 clinically important TBI cuts or website low/high labels.

Formula

Infant Scalp Score = age_points + hematoma_size + hematoma_location; age 0-2 mo → 3, 3-5 → 2, 6-11 → 1, ≥12 → 0; size caller-assigned 0-3; location 0 frontal / 1 occipital / 2 temporal-parietal; max 8

Citation

Title: Clinical significance of scalp abnormalities in asymptomatic head-injured infants
Authors: Greenes DS, Schutzman SA
Source: Pediatr Emerg Care. 2001;17(2):88-92
DOI: 10.1097/00006565-200104000-00002

Worked example

≥12 months, no hematoma, frontal

Given: age_months=13hematoma_location=0hematoma_size=0

age 13 months → 0; hematoma_size 0 (none); hematoma_location 0 (frontal)
Score = 0 (max 8)

0-2 months, large temporal/parietal hematoma

Given: age_months=1hematoma_location=2hematoma_size=3

age 1 month → 3; hematoma_size 3 (large); hematoma_location 2 (temporal/parietal)
Score = 8 (max 8)

Also searched as

Infant scalp score
Greenes infant scalp score
infant scalp hematoma score
Greenes 2001 scalp score
asymptomatic infant scalp hematoma
infant hematoma scalp points
scalp abnormalities head-injured infants

Try

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

/api/calc/infant_scalp?age_months=13&hematoma_size=0&hematoma_location=0

Full URL: https://api.magentlab.com/api/calc/infant_scalp?age_months=13&hematoma_size=0&hematoma_location=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/infant_scalp?age_months=13&hematoma_size=0&hematoma_location=0"

Parameters

Name	Type	Required	Description
`age_months`	integer	required	Age in completed months, integer 0-24 as in Greenes 2001 (infants 0-24 months). Points: 0-2 months → 3; 3-5 → 2; 6-11 → 1; ≥12 → 0. magent does not convert years or days.
`hematoma_size`	integer	required	Caller-assigned hematoma size points 0-3 (0 none, 1 small, 2 medium, 3 large). magent does not measure the hematoma or invent centimeter cuts.
`hematoma_location`	integer	required	Caller-assigned hematoma location points (0 frontal, 1 occipital, 2 temporal/parietal). magent does not examine the scalp.

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/infant_scalp 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": [
    {
      "age_months": "13",
      "hematoma_location": "0",
      "hematoma_size": "0"
    },
    {
      "age_months": "13",
      "hematoma_location": "0",
      "hematoma_size": "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/infant_scalp",
  "items": [
    {
      "components": [
        {
          "value": 13,
          "factor": "age_months",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hematoma_size",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hematoma_location",
          "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": "Greenes DS, Schutzman SA",
        "doi": "10.1097/00006565-200104000-00002",
        "id": "greenes-2001",
        "pmid": "11334014",
        "source": "Pediatr Emerg Care. 2001;17(2):88-92",
        "title": "Clinical significance of scalp abnormalities in asymptomatic head-injured infants"
      },
      "formula": "infant_scalp",
      "formula_expression": "Infant Scalp Score = age_points + hematoma_size + hematoma_location; age 0-2 mo → 3, 3-5 → 2, 6-11 → 1, ≥12 → 0; size caller-assigned 0-3; location 0 frontal / 1 occipital / 2 temporal-parietal; max 8",
      "max_score": 8,
      "score": 0
    },
    {
      "components": [
        {
          "value": 13,
          "factor": "age_months",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hematoma_size",
          "points": 0,
          "present": true
        },
        {
          "value": 0,
          "factor": "hematoma_location",
          "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": "Greenes DS, Schutzman SA",
        "doi": "10.1097/00006565-200104000-00002",
        "id": "greenes-2001",
        "pmid": "11334014",
        "source": "Pediatr Emerg Care. 2001;17(2):88-92",
        "title": "Clinical significance of scalp abnormalities in asymptomatic head-injured infants"
      },
      "formula": "infant_scalp",
      "formula_expression": "Infant Scalp Score = age_points + hematoma_size + hematoma_location; age 0-2 mo → 3, 3-5 → 2, 6-11 → 1, ≥12 → 0; size caller-assigned 0-3; location 0 frontal / 1 occipital / 2 temporal-parietal; max 8",
      "max_score": 8,
      "score": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	infant_scalp
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-8
`max_score`	integer	Always 8
`components`	array	Age, hematoma-size, and location points
`citation`	object	Greenes and Schutzman 2001 citation
`disclaimer`	string	Not a medical device

Example JSON

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

{
  "components": [
    {
      "value": 13,
      "factor": "age_months",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "hematoma_size",
      "points": 0,
      "present": true
    },
    {
      "value": 0,
      "factor": "hematoma_location",
      "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": "Greenes DS, Schutzman SA",
    "doi": "10.1097/00006565-200104000-00002",
    "id": "greenes-2001",
    "pmid": "11334014",
    "source": "Pediatr Emerg Care. 2001;17(2):88-92",
    "title": "Clinical significance of scalp abnormalities in asymptomatic head-injured infants"
  },
  "formula": "infant_scalp",
  "formula_expression": "Infant Scalp Score = age_points + hematoma_size + hematoma_location; age 0-2 mo → 3, 3-5 → 2, 6-11 → 1, ≥12 → 0; size caller-assigned 0-3; location 0 frontal / 1 occipital / 2 temporal-parietal; max 8",
  "max_score": 8,
  "score": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_infant_scalp`	Infant scalp score inputs must match Greenes 2001 age, hematoma size, and hematoma location from that paper. 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

PECARN pediatric head CT — Apply the Kuppermann 2009 PECARN prediction trees and return high, intermediate, or low risk of clinically important brain injury from caller-assigned findings after pediatric head trauma.
CATCH — Apply the Osmond 2010 CATCH derivation and return high, medium, or low risk plus whether CT of the head is indicated from seven caller-assigned findings after pediatric minor head injury.
CHALICE — Apply the Dunning 2006 CHALICE rule and return whether CT is required from caller-assigned history, examination, and mechanism findings after head injury in a child younger than 16.

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.