Pediatric appendicitis score

Compute the Samuel 2002 pediatric appendicitis score from eight caller-assigned findings in children aged 4-15.

WEDGE $0.005 USDC GET /api/calc/pas

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

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

What it computes

Compute the Samuel 2002 pediatric appendicitis score from eight caller-assigned findings in children aged 4-15.

When to use

When an agent needs the published Samuel 2002 PAS total and must not invent fever or laboratory cutoffs, treat the total as an operating-room protocol, or substitute Alvarado 1986 (MANTRELS).

When not to use

Not a medical device and not a diagnosis or operating-room protocol.
Samuel 2002 derivation ages 4-15 only. Age does not add points.
This is Samuel 2002 PAS, not Alvarado 1986 (MANTRELS). Pyrexia, leukocytosis, and neutrophilia are caller-assigned flags; magent does not apply unpublished °C or WBC cutoffs.
Findings are caller-assigned. magent does not examine the abdomen.

Formula

PAS = 2*cough_percussion_hopping_rlq + anorexia + pyrexia + nausea_emesis + 2*rif_tenderness + leukocytosis + neutrophilia + migration; max 10

Citation

Title: Pediatric appendicitis score
Authors: Samuel M
Source: J Pediatr Surg. 2002;37(6):877-881
DOI: 10.1053/jpsu.2002.32893

Worked example

Age 10, all flags false

Given: age=10anorexia=falsecough_percussion_hopping_rlq=falseleukocytosis=falsemigration=falsenausea_emesis=falseneutrophilia=falsepyrexia=falserif_tenderness=false

Age 10 (in 4-15). Eight flags false.
Score = 0; max 10. Age does not add points.

Also searched as

pediatric appendicitis score
samuel
pas
appendicitis
samuel 2002
pediatric appendicitis

Try

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

/api/calc/pas?age=10&cough_percussion_hopping_rlq=false&anorexia=false&pyrexia=false&nausea_emesis=false&rif_tenderness=false&leukocytosis=false&neutrophilia=false&migration=false

Full URL: https://api.magentlab.com/api/calc/pas?age=10&cough_percussion_hopping_rlq=false&anorexia=false&pyrexia=false&nausea_emesis=false&rif_tenderness=false&leukocytosis=false&neutrophilia=false&migration=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/pas?age=10&cough_percussion_hopping_rlq=false&anorexia=false&pyrexia=false&nausea_emesis=false&rif_tenderness=false&leukocytosis=false&neutrophilia=false&migration=false"

Parameters

Name	Type	Required	Description
`age`	integer	required	Age in years as an integer from 4 to 15 (Samuel 2002 derivation cohort). Age does not add points. 3 and 16 are rejected.
`cough_percussion_hopping_rlq`	boolean	required	Cough, percussion, or hopping tenderness in the right lower quadrant (Samuel physical sign 1). true scores 2; false scores 0.
`anorexia`	boolean	required	Anorexia (Samuel). true scores 1; false scores 0.
`pyrexia`	boolean	required	Caller-assigned pyrexia (Samuel named pyrexia; the derivation paper does not publish a °C cutoff). true scores 1; false scores 0.
`nausea_emesis`	boolean	required	Nausea or emesis (Samuel). true scores 1; false scores 0.
`rif_tenderness`	boolean	required	Tenderness over the right iliac fossa (Samuel physical sign 5). true scores 2; false scores 0.
`leukocytosis`	boolean	required	Caller-assigned leukocytosis (Samuel 2002; no published WBC cutoff). true scores 1; false scores 0.
`neutrophilia`	boolean	required	Caller-assigned neutrophilia (Samuel 2002; no published percent or count cutoff). true scores 1; false scores 0.
`migration`	boolean	required	Migration of pain (Samuel). true scores 1; false scores 0.

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/pas 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": "10",
      "anorexia": "false",
      "cough_percussion_hopping_rlq": "false",
      "leukocytosis": "false",
      "migration": "false",
      "nausea_emesis": "false",
      "neutrophilia": "false",
      "pyrexia": "false",
      "rif_tenderness": "false"
    },
    {
      "age": "10",
      "anorexia": "false",
      "cough_percussion_hopping_rlq": "false",
      "leukocytosis": "false",
      "migration": "false",
      "nausea_emesis": "false",
      "neutrophilia": "false",
      "pyrexia": "false",
      "rif_tenderness": "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/pas",
  "items": [
    {
      "components": [
        {
          "factor": "cough_percussion_hopping_rlq",
          "points": 0,
          "present": false
        },
        {
          "factor": "anorexia",
          "points": 0,
          "present": false
        },
        {
          "factor": "pyrexia",
          "points": 0,
          "present": false
        },
        {
          "factor": "nausea_emesis",
          "points": 0,
          "present": false
        },
        {
          "factor": "rif_tenderness",
          "points": 0,
          "present": false
        },
        {
          "factor": "leukocytosis",
          "points": 0,
          "present": false
        },
        {
          "factor": "neutrophilia",
          "points": 0,
          "present": false
        },
        {
          "factor": "migration",
          "points": 0,
          "present": false
        }
      ],
      "age": 10,
      "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": "Samuel M",
        "doi": "10.1053/jpsu.2002.32893",
        "id": "samuel-2002",
        "pmid": "12037754",
        "source": "J Pediatr Surg. 2002;37(6):877-881",
        "title": "Pediatric appendicitis score"
      },
      "formula": "pas",
      "formula_expression": "PAS = 2*cough_percussion_hopping_rlq + anorexia + pyrexia + nausea_emesis + 2*rif_tenderness + leukocytosis + neutrophilia + migration; max 10",
      "max_score": 10,
      "score": 0
    },
    {
      "components": [
        {
          "factor": "cough_percussion_hopping_rlq",
          "points": 0,
          "present": false
        },
        {
          "factor": "anorexia",
          "points": 0,
          "present": false
        },
        {
          "factor": "pyrexia",
          "points": 0,
          "present": false
        },
        {
          "factor": "nausea_emesis",
          "points": 0,
          "present": false
        },
        {
          "factor": "rif_tenderness",
          "points": 0,
          "present": false
        },
        {
          "factor": "leukocytosis",
          "points": 0,
          "present": false
        },
        {
          "factor": "neutrophilia",
          "points": 0,
          "present": false
        },
        {
          "factor": "migration",
          "points": 0,
          "present": false
        }
      ],
      "age": 10,
      "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": "Samuel M",
        "doi": "10.1053/jpsu.2002.32893",
        "id": "samuel-2002",
        "pmid": "12037754",
        "source": "J Pediatr Surg. 2002;37(6):877-881",
        "title": "Pediatric appendicitis score"
      },
      "formula": "pas",
      "formula_expression": "PAS = 2*cough_percussion_hopping_rlq + anorexia + pyrexia + nausea_emesis + 2*rif_tenderness + leukocytosis + neutrophilia + migration; max 10",
      "max_score": 10,
      "score": 0
    }
  ]
}

Response

Field	Type	Description
`formula`	string	pas
`formula_expression`	string	Exact expression used
`score`	integer	Total points 0-10
`max_score`	integer	Always 10
`age`	integer	Age in years used (4-15). Age does not add points.
`components`	array	Per-factor Samuel 2002 points
`citation`	object	Samuel 2002 citation
`disclaimer`	string	Not-a-device notice

Example JSON

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

{
  "components": [
    {
      "factor": "cough_percussion_hopping_rlq",
      "points": 0,
      "present": false
    },
    {
      "factor": "anorexia",
      "points": 0,
      "present": false
    },
    {
      "factor": "pyrexia",
      "points": 0,
      "present": false
    },
    {
      "factor": "nausea_emesis",
      "points": 0,
      "present": false
    },
    {
      "factor": "rif_tenderness",
      "points": 0,
      "present": false
    },
    {
      "factor": "leukocytosis",
      "points": 0,
      "present": false
    },
    {
      "factor": "neutrophilia",
      "points": 0,
      "present": false
    },
    {
      "factor": "migration",
      "points": 0,
      "present": false
    }
  ],
  "age": 10,
  "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": "Samuel M",
    "doi": "10.1053/jpsu.2002.32893",
    "id": "samuel-2002",
    "pmid": "12037754",
    "source": "J Pediatr Surg. 2002;37(6):877-881",
    "title": "Pediatric appendicitis score"
  },
  "formula": "pas",
  "formula_expression": "PAS = 2*cough_percussion_hopping_rlq + anorexia + pyrexia + nausea_emesis + 2*rif_tenderness + leukocytosis + neutrophilia + migration; max 10",
  "max_score": 10,
  "score": 0
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_pas_age`	age must be an integer from 4 to 15 (Samuel 2002). Returned before settlement; you are not charged.
400	`invalid_flag`	boolean clinical flags must be true or false 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

Alvarado score — Compute the Alvarado 1986 MANTRELS score from caller-assigned findings, temperature, WBC, and neutrophil percent.

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.
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.