Emergency · LIVE

PedSRC blunt abdomen

Apply the Streck 2017 Pediatric Surgery Research Collaborative five-variable prediction rule and return whether the child is at very low risk of blunt intra-abdominal injury (none of five caller-assigned findings present). Does not order a CT.

LIVE $0.005 USDC GET /api/calc/pedsrc

Markdown: /docs/pedsrc.md · Canonical: https://magentlab.com/docs/pedsrc

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

What it computes

Apply the Streck 2017 Pediatric Surgery Research Collaborative five-variable prediction rule and return whether the child is at very low risk of blunt intra-abdominal injury (none of five caller-assigned findings present). Does not order a CT.

When to use

When an agent has caller-assigned findings after blunt abdominal trauma in a child and needs the Streck 2017 PedSRC rule, not Holmes 2013 PECARN IAI (pecarn-iai).

When not to use

• Not a medical device. Not a diagnosis. magent does not examine the child.
• This tool is the Streck 2017 five-variable PedSRC prediction rule only. It is not Holmes 2013 PECARN IAI (pecarn-iai). Presence of a criterion does not mandate CT. Do not order a CT from this tool.
• AST is a positive variable iff greater than 200 U/L (200 is not positive). magent does not assay AST, amylase, or lipase; the caller assigns abnormal_pancreatic_enzymes.
• magent does not take age. The published derivation was age <16 years. The five clinical variables determine very_low_risk.

Formula

very_low_risk iff no ast_gt_200 and no abnormal_abdominal_exam and no abnormal_chest_xray and no abdominal_pain and no abnormal_pancreatic_enzymes

Citation

Title

Identifying Children at Very Low Risk for Blunt Intra-Abdominal Injury in Whom CT of the Abdomen Can Be Avoided Safely

Authors

Streck CJ, Blakely ML, Huang EY, Vogel AM, Santore MT, Tsao K, Falcone RA, Dassinger MS, Haynes JH, Russell RT, Naik-Mathuria BJ, St Peter SD, Mooney DP, Upperman JS; Pediatric Surgery Research Collaborative

Source

J Am Coll Surg. 2017;224(4):449-458.e3

DOI

10.1016/j.jamcollsurg.2016.12.041

Worked example

Also searched as

• PedSRC
• Streck 2017
• pediatric blunt abdominal trauma
• very low risk intra-abdominal injury
• PedSRC abdominal CT rule
• Pediatric Surgery Research Collaborative
• blunt IAI children
• Streck abdominal injury prediction

Try

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

/api/calc/pedsrc?ast_u_l=80&abnormal_abdominal_exam=false&abnormal_chest_xray=false&abdominal_pain=false&abnormal_pancreatic_enzymes=false

Full URL: https://api.magentlab.com/api/calc/pedsrc?ast_u_l=80&abnormal_abdominal_exam=false&abnormal_chest_xray=false&abdominal_pain=false&abnormal_pancreatic_enzymes=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/pedsrc?ast_u_l=80&abnormal_abdominal_exam=false&abnormal_chest_xray=false&abdominal_pain=false&abnormal_pancreatic_enzymes=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/pedsrc 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",
      "abnormal_abdominal_exam": "false",
      "abnormal_chest_xray": "false",
      "abnormal_pancreatic_enzymes": "false",
      "ast_u_l": "80"
    },
    {
      "abdominal_pain": "false",
      "abnormal_abdominal_exam": "false",
      "abnormal_chest_xray": "false",
      "abnormal_pancreatic_enzymes": "false",
      "ast_u_l": "80"
    }
  ]
}

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/pedsrc",
  "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": "Streck CJ, Blakely ML, Huang EY, Vogel AM, Santore MT, Tsao K, Falcone RA, Dassinger MS, Haynes JH, Russell RT, Naik-Mathuria BJ, St Peter SD, Mooney DP, Upperman JS; Pediatric Surgery Research Collaborative",
        "doi": "10.1016/j.jamcollsurg.2016.12.041",
        "id": "streck-2017",
        "pmid": "28130170",
        "source": "J Am Coll Surg. 2017;224(4):449-458.e3",
        "title": "Identifying Children at Very Low Risk for Blunt Intra-Abdominal Injury in Whom CT of the Abdomen Can Be Avoided Safely"
      },
      "formula": "pedsrc",
      "formula_expression": "very_low_risk iff no ast_gt_200 and no abnormal_abdominal_exam and no abnormal_chest_xray and no abdominal_pain and no abnormal_pancreatic_enzymes",
      "ast_u_l": 80.0,
      "criteria": [
        {
          "value": 80.0,
          "factor": "no_ast_gt_200",
          "met": true
        },
        {
          "factor": "no_abnormal_abdominal_exam",
          "met": true
        },
        {
          "factor": "no_abnormal_chest_xray",
          "met": true
        },
        {
          "factor": "no_abdominal_pain",
          "met": true
        },
        {
          "factor": "no_abnormal_pancreatic_enzymes",
          "met": true
        }
      ],
      "very_low_risk": 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": "Streck CJ, Blakely ML, Huang EY, Vogel AM, Santore MT, Tsao K, Falcone RA, Dassinger MS, Haynes JH, Russell RT, Naik-Mathuria BJ, St Peter SD, Mooney DP, Upperman JS; Pediatric Surgery Research Collaborative",
        "doi": "10.1016/j.jamcollsurg.2016.12.041",
        "id": "streck-2017",
        "pmid": "28130170",
        "source": "J Am Coll Surg. 2017;224(4):449-458.e3",
        "title": "Identifying Children at Very Low Risk for Blunt Intra-Abdominal Injury in Whom CT of the Abdomen Can Be Avoided Safely"
      },
      "formula": "pedsrc",
      "formula_expression": "very_low_risk iff no ast_gt_200 and no abnormal_abdominal_exam and no abnormal_chest_xray and no abdominal_pain and no abnormal_pancreatic_enzymes",
      "ast_u_l": 80.0,
      "criteria": [
        {
          "value": 80.0,
          "factor": "no_ast_gt_200",
          "met": true
        },
        {
          "factor": "no_abnormal_abdominal_exam",
          "met": true
        },
        {
          "factor": "no_abnormal_chest_xray",
          "met": true
        },
        {
          "factor": "no_abdominal_pain",
          "met": true
        },
        {
          "factor": "no_abnormal_pancreatic_enzymes",
          "met": true
        }
      ],
      "very_low_risk": 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": "Streck CJ, Blakely ML, Huang EY, Vogel AM, Santore MT, Tsao K, Falcone RA, Dassinger MS, Haynes JH, Russell RT, Naik-Mathuria BJ, St Peter SD, Mooney DP, Upperman JS; Pediatric Surgery Research Collaborative",
    "doi": "10.1016/j.jamcollsurg.2016.12.041",
    "id": "streck-2017",
    "pmid": "28130170",
    "source": "J Am Coll Surg. 2017;224(4):449-458.e3",
    "title": "Identifying Children at Very Low Risk for Blunt Intra-Abdominal Injury in Whom CT of the Abdomen Can Be Avoided Safely"
  },
  "formula": "pedsrc",
  "formula_expression": "very_low_risk iff no ast_gt_200 and no abnormal_abdominal_exam and no abnormal_chest_xray and no abdominal_pain and no abnormal_pancreatic_enzymes",
  "ast_u_l": 80.0,
  "criteria": [
    {
      "value": 80.0,
      "factor": "no_ast_gt_200",
      "met": true
    },
    {
      "factor": "no_abnormal_abdominal_exam",
      "met": true
    },
    {
      "factor": "no_abnormal_chest_xray",
      "met": true
    },
    {
      "factor": "no_abdominal_pain",
      "met": true
    },
    {
      "factor": "no_abnormal_pancreatic_enzymes",
      "met": true
    }
  ],
  "very_low_risk": true
}

Client errors (HTTP 400)

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

Related tools

• 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.
• SIPA — Compute Acker 2015 SIPA as heart rate in bpm divided by cuff systolic pressure in mm Hg, then compare the ratio with the published age-band cutoff.
• 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.

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.