# Infant scalp score

Infant scalp score

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/infant_scalp`
HTML: https://magentlab.com/docs/infant-scalp
Markdown: https://magentlab.com/docs/infant-scalp.md

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

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

## Worked example

### ≥12 months, no hematoma, frontal

Given: `age_months=13, hematoma_location=0, hematoma_size=0`

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


### 0-2 months, large temporal/parietal hematoma

Given: `age_months=1, hematoma_location=2, hematoma_size=3`

1. age 1 month → 3; hematoma_size 3 (large); hematoma_location 2 (temporal/parietal)
2. 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

## Parameters

- `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.

Method: `POST /api/calc/infant_scalp`
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": [
    {
      "age_months": "13",
      "hematoma_location": "0",
      "hematoma_size": "0"
    },
    {
      "age_months": "13",
      "hematoma_location": "0",
      "hematoma_size": "0"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/infant-scalp

Example 200:

```json
{
  "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 fields

- `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

Frozen fixture. Not a live lookup.

```json
{
  "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
}
```

## Errors

- HTTP 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.
- 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

- [PECARN pediatric head CT](https://magentlab.com/docs/pecarn-head) — 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](https://magentlab.com/docs/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](https://magentlab.com/docs/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.

- 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.