Emergency · LIVE

PECARN pediatric IAI

Apply the Holmes 2013 PECARN seven-variable prediction rule and return whether the child is at very low risk of intra-abdominal injury requiring acute intervention (all seven caller-assigned findings absent). Does not order a CT.

LIVE $0.005 USDC GET /api/calc/pecarn_iai

Markdown: /docs/pecarn-iai.md · Canonical: https://magentlab.com/docs/pecarn-iai

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

What it computes

Apply the Holmes 2013 PECARN seven-variable prediction rule and return whether the child is at very low risk of intra-abdominal injury requiring acute intervention (all seven caller-assigned findings absent). Does not order a CT.

When to use

When an agent has caller-assigned findings after blunt torso trauma in a child and needs the Holmes 2013 PECARN IAI rule, not PECARN head CT (pecarn-head).

When not to use

• Not a medical device. Not a diagnosis. magent does not examine the patient.
• This tool is the Holmes 2013 PECARN seven-variable IAI prediction rule only. It is not PECARN head CT (pecarn-head) and does not implement the 2024 Lancet validation as a second rule.
• Very low risk of IAI requiring acute intervention only when all seven caller-assigned findings are absent. Presence of a criterion does not mandate CT. Do not order a CT from this tool.
• The caller assigns all flags, including GCS <14 (not the PECARN head GCS <=14 flag). magent does not take a GCS integer or classify mechanism.

Formula

very_low_risk_iai_intervention iff no abdominal_wall_trauma_or_seatbelt_sign and no gcs_less_than_14 and no abdominal_tenderness and no thoracic_wall_trauma and no abdominal_pain and no decreased_breath_sounds and no vomiting

Citation

Title

Identifying children at very low risk of clinically important blunt abdominal injuries

Authors

Holmes JF, Lillis K, Monroe D, Borgialli D, Kerrey BT, Mahajan P, Adelgais K, Ellison AM, Yen K, Atabaki S, Menaker J, Bonsu B, Quayle KS, Garcia M, Rogers A, Blumberg S, Lee L, Tunik M, Kooistra J, Kwok M, Cook LJ, Dean JM, Sokolove PE, Wisner DH, Ehrlich P, Cooper A, Dayan PS, Wootton-Gorges S, Kuppermann N

Source

Ann Emerg Med. 2013;62(2):107-116.e2

DOI

10.1016/j.annemergmed.2012.11.009

Worked example

Also searched as

• PECARN IAI
• PECARN abdominal injury
• Holmes 2013 abdominal
• pediatric intra-abdominal injury
• PECARN blunt abdominal trauma
• IAI requiring intervention
• children very low risk abdominal injury
• PECARN pediatric IAI algorithm

Try

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

/api/calc/pecarn_iai?abdominal_wall_trauma_or_seatbelt_sign=false&gcs_less_than_14=false&abdominal_tenderness=false&thoracic_wall_trauma=false&abdominal_pain=false&decreased_breath_sounds=false&vomiting=false

Full URL: https://api.magentlab.com/api/calc/pecarn_iai?abdominal_wall_trauma_or_seatbelt_sign=false&gcs_less_than_14=false&abdominal_tenderness=false&thoracic_wall_trauma=false&abdominal_pain=false&decreased_breath_sounds=false&vomiting=false

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/pecarn_iai?abdominal_wall_trauma_or_seatbelt_sign=false&gcs_less_than_14=false&abdominal_tenderness=false&thoracic_wall_trauma=false&abdominal_pain=false&decreased_breath_sounds=false&vomiting=false"

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/pecarn_iai 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": [
    {
      "abdominal_pain": "false",
      "abdominal_tenderness": "false",
      "abdominal_wall_trauma_or_seatbelt_sign": "false",
      "decreased_breath_sounds": "false",
      "gcs_less_than_14": "false",
      "thoracic_wall_trauma": "false",
      "vomiting": "false"
    },
    {
      "abdominal_pain": "false",
      "abdominal_tenderness": "false",
      "abdominal_wall_trauma_or_seatbelt_sign": "false",
      "decreased_breath_sounds": "false",
      "gcs_less_than_14": "false",
      "thoracic_wall_trauma": "false",
      "vomiting": "false"
    }
  ]
}

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/pecarn_iai",
  "items": [
    {
      "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": "Holmes JF, Lillis K, Monroe D, Borgialli D, Kerrey BT, Mahajan P, Adelgais K, Ellison AM, Yen K, Atabaki S, Menaker J, Bonsu B, Quayle KS, Garcia M, Rogers A, Blumberg S, Lee L, Tunik M, Kooistra J, Kwok M, Cook LJ, Dean JM, Sokolove PE, Wisner DH, Ehrlich P, Cooper A, Dayan PS, Wootton-Gorges S, Kuppermann N",
        "doi": "10.1016/j.annemergmed.2012.11.009",
        "id": "holmes-2013",
        "source": "Ann Emerg Med. 2013;62(2):107-116.e2",
        "title": "Identifying children at very low risk of clinically important blunt abdominal injuries"
      },
      "formula": "pecarn_iai",
      "formula_expression": "very_low_risk_iai_intervention iff no abdominal_wall_trauma_or_seatbelt_sign and no gcs_less_than_14 and no abdominal_tenderness and no thoracic_wall_trauma and no abdominal_pain and no decreased_breath_sounds and no vomiting",
      "criteria": [
        {
          "factor": "no_abdominal_wall_trauma_or_seatbelt_sign",
          "met": true
        },
        {
          "factor": "no_gcs_less_than_14",
          "met": true
        },
        {
          "factor": "no_abdominal_tenderness",
          "met": true
        },
        {
          "factor": "no_thoracic_wall_trauma",
          "met": true
        },
        {
          "factor": "no_abdominal_pain",
          "met": true
        },
        {
          "factor": "no_decreased_breath_sounds",
          "met": true
        },
        {
          "factor": "no_vomiting",
          "met": true
        }
      ],
      "very_low_risk_iai_intervention": 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": "Holmes JF, Lillis K, Monroe D, Borgialli D, Kerrey BT, Mahajan P, Adelgais K, Ellison AM, Yen K, Atabaki S, Menaker J, Bonsu B, Quayle KS, Garcia M, Rogers A, Blumberg S, Lee L, Tunik M, Kooistra J, Kwok M, Cook LJ, Dean JM, Sokolove PE, Wisner DH, Ehrlich P, Cooper A, Dayan PS, Wootton-Gorges S, Kuppermann N",
        "doi": "10.1016/j.annemergmed.2012.11.009",
        "id": "holmes-2013",
        "source": "Ann Emerg Med. 2013;62(2):107-116.e2",
        "title": "Identifying children at very low risk of clinically important blunt abdominal injuries"
      },
      "formula": "pecarn_iai",
      "formula_expression": "very_low_risk_iai_intervention iff no abdominal_wall_trauma_or_seatbelt_sign and no gcs_less_than_14 and no abdominal_tenderness and no thoracic_wall_trauma and no abdominal_pain and no decreased_breath_sounds and no vomiting",
      "criteria": [
        {
          "factor": "no_abdominal_wall_trauma_or_seatbelt_sign",
          "met": true
        },
        {
          "factor": "no_gcs_less_than_14",
          "met": true
        },
        {
          "factor": "no_abdominal_tenderness",
          "met": true
        },
        {
          "factor": "no_thoracic_wall_trauma",
          "met": true
        },
        {
          "factor": "no_abdominal_pain",
          "met": true
        },
        {
          "factor": "no_decreased_breath_sounds",
          "met": true
        },
        {
          "factor": "no_vomiting",
          "met": true
        }
      ],
      "very_low_risk_iai_intervention": true
    }
  ]
}

Response

Example JSON

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

{
  "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": "Holmes JF, Lillis K, Monroe D, Borgialli D, Kerrey BT, Mahajan P, Adelgais K, Ellison AM, Yen K, Atabaki S, Menaker J, Bonsu B, Quayle KS, Garcia M, Rogers A, Blumberg S, Lee L, Tunik M, Kooistra J, Kwok M, Cook LJ, Dean JM, Sokolove PE, Wisner DH, Ehrlich P, Cooper A, Dayan PS, Wootton-Gorges S, Kuppermann N",
    "doi": "10.1016/j.annemergmed.2012.11.009",
    "id": "holmes-2013",
    "source": "Ann Emerg Med. 2013;62(2):107-116.e2",
    "title": "Identifying children at very low risk of clinically important blunt abdominal injuries"
  },
  "formula": "pecarn_iai",
  "formula_expression": "very_low_risk_iai_intervention iff no abdominal_wall_trauma_or_seatbelt_sign and no gcs_less_than_14 and no abdominal_tenderness and no thoracic_wall_trauma and no abdominal_pain and no decreased_breath_sounds and no vomiting",
  "criteria": [
    {
      "factor": "no_abdominal_wall_trauma_or_seatbelt_sign",
      "met": true
    },
    {
      "factor": "no_gcs_less_than_14",
      "met": true
    },
    {
      "factor": "no_abdominal_tenderness",
      "met": true
    },
    {
      "factor": "no_thoracic_wall_trauma",
      "met": true
    },
    {
      "factor": "no_abdominal_pain",
      "met": true
    },
    {
      "factor": "no_decreased_breath_sounds",
      "met": true
    },
    {
      "factor": "no_vomiting",
      "met": true
    }
  ],
  "very_low_risk_iai_intervention": true
}

Client errors (HTTP 400)

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

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.
• NEXUS Chest CT — Apply the Rodriguez 2015 NEXUS Chest CT-Major and Chest CT-All decision instruments and return whether each is negative (all of that instrument's caller-assigned criteria absent). Does not order a CT.

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.