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PELD score (McDiarmid 2002)

PELD

Compute the McDiarmid 2002 Pediatric End-Stage Liver Disease listing arithmetic from bilirubin, INR, albumin, age, and growth failure.

LIVE $0.005 USDC GET /api/calc/peld

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

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

What it computes

Compute the McDiarmid 2002 Pediatric End-Stage Liver Disease listing arithmetic from bilirubin, INR, albumin, age, and growth failure.

When to use

When an agent needs the published PELD integer and must not invent waitlist exception points.

When not to use

  • Not a transplant listing protocol or allocation decision.
  • McDiarmid 2002 listing arithmetic only. Does not add waitlist exception points, status 1, or creatinine.
  • Bilirubin, INR, and albumin below 1.0 are floored at 1.0 before ln (same class of lab floor as OPTN MELD).
  • PELD is for children under 12 years. Age 12 and older is rejected.

Formula

raw = 0.480*ln(bili) + 1.857*ln(INR) - 0.687*ln(albumin) + 0.436*[age<1] + 0.667*[growth_failure]; PELD = round(10 * raw); bili, INR, and albumin floored at 1.0

Citation

Title
Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation
Authors
McDiarmid SV, Anand R, Lindblad AS; SPLIT Research Group
Source
Transplantation. 2002;74(2):173-181
DOI
10.1097/00007890-200207270-00006

Worked example

Age 2, bili 4.0, INR 1.5, albumin 2.5, no growth failure

Given: age_years=2albumin_g_dl=2.5bilirubin_mg_dl=4.0growth_failure=falseinr=1.5

  1. Floor bilirubin, INR, and albumin at 1.0.
  2. raw = 0.480*ln(bili) + 1.857*ln(INR) - 0.687*ln(albumin) + 0.436*[age<1] + 0.667*[growth_failure]
  3. PELD = round(10 * raw)

Also searched as

  • PELD
  • Pediatric End-Stage Liver Disease
  • McDiarmid PELD
  • pediatric MELD
  • PELD score

Try

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

/api/calc/peld?age_years=2&bilirubin_mg_dl=4.0&inr=1.5&albumin_g_dl=2.5&growth_failure=false

Full URL: https://api.magentlab.com/api/calc/peld?age_years=2&bilirubin_mg_dl=4.0&inr=1.5&albumin_g_dl=2.5&growth_failure=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/peld?age_years=2&bilirubin_mg_dl=4.0&inr=1.5&albumin_g_dl=2.5&growth_failure=false"

Parameters

Name Type Required Description
age_years number required Age in years (0-11 inclusive). PELD is for children under 12. Age under 1 adds 0.436 before scaling.
bilirubin_mg_dl number optional Total bilirubin in mg/dL (0.1-40). Provide this or bilirubin_umol_l, not both. Floored at 1.0 before ln.
bilirubin_umol_l number optional Total bilirubin in µmol/L. Converted as mg/dL = µmol/L / 17.1.
inr number required INR (0.8-10). Floored at 1.0 before ln.
albumin_g_dl number optional Albumin in g/dL (1-6). Provide this or albumin_g_l, not both. Floored at 1.0 before ln.
albumin_g_l number optional Albumin in g/L. Converted as g/dL = g/L / 10.
growth_failure boolean required Growth failure as assigned by the caller. true adds 0.667 before scaling.

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/peld 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_years": "2",
      "albumin_g_dl": "2.5",
      "bilirubin_mg_dl": "4.0",
      "growth_failure": "false",
      "inr": "1.5"
    },
    {
      "age_years": "2",
      "albumin_g_dl": "2.5",
      "bilirubin_mg_dl": "4.0",
      "growth_failure": "false",
      "inr": "1.5"
    }
  ]
}

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/peld",
  "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.",
      "age_years": 2.0,
      "citation": {
        "authors": "McDiarmid SV, Anand R, Lindblad AS; SPLIT Research Group",
        "doi": "10.1097/00007890-200207270-00006",
        "id": "mcdiarmid-2002",
        "source": "Transplantation. 2002;74(2):173-181",
        "title": "Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation"
      },
      "formula": "peld",
      "formula_expression": "raw = 0.480*ln(bili) + 1.857*ln(INR) - 0.687*ln(albumin) + 0.436*[age<1] + 0.667*[growth_failure]; PELD = round(10 * raw); bili, INR, and albumin floored at 1.0",
      "albumin_g_dl": 2.5,
      "inr": 1.5,
      "bilirubin_mg_dl": 4.0,
      "bilirubin_used_mg_dl": 4.0,
      "inr_used": 1.5,
      "albumin_used_g_dl": 2.5,
      "age_lt_1": false,
      "growth_failure": false,
      "peld": 8
    },
    {
      "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.",
      "age_years": 2.0,
      "citation": {
        "authors": "McDiarmid SV, Anand R, Lindblad AS; SPLIT Research Group",
        "doi": "10.1097/00007890-200207270-00006",
        "id": "mcdiarmid-2002",
        "source": "Transplantation. 2002;74(2):173-181",
        "title": "Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation"
      },
      "formula": "peld",
      "formula_expression": "raw = 0.480*ln(bili) + 1.857*ln(INR) - 0.687*ln(albumin) + 0.436*[age<1] + 0.667*[growth_failure]; PELD = round(10 * raw); bili, INR, and albumin floored at 1.0",
      "albumin_g_dl": 2.5,
      "inr": 1.5,
      "bilirubin_mg_dl": 4.0,
      "bilirubin_used_mg_dl": 4.0,
      "inr_used": 1.5,
      "albumin_used_g_dl": 2.5,
      "age_lt_1": false,
      "growth_failure": false,
      "peld": 8
    }
  ]
}

Response

Field Type Description
formula string peld
formula_expression string Exact expression used
bilirubin_mg_dl number Input bilirubin in mg/dL
albumin_g_dl number Input albumin in g/dL
inr number Input INR
bilirubin_used_mg_dl number Bilirubin after 1.0 floor
albumin_used_g_dl number Albumin after 1.0 floor
inr_used number INR after 1.0 floor
age_years number Input age in years
age_lt_1 boolean true when age_years < 1
growth_failure boolean Input growth-failure flag
peld integer PELD, nearest integer
citation object McDiarmid 2002 citation
disclaimer string Not-a-device notice

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.",
  "age_years": 2.0,
  "citation": {
    "authors": "McDiarmid SV, Anand R, Lindblad AS; SPLIT Research Group",
    "doi": "10.1097/00007890-200207270-00006",
    "id": "mcdiarmid-2002",
    "source": "Transplantation. 2002;74(2):173-181",
    "title": "Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation"
  },
  "formula": "peld",
  "formula_expression": "raw = 0.480*ln(bili) + 1.857*ln(INR) - 0.687*ln(albumin) + 0.436*[age<1] + 0.667*[growth_failure]; PELD = round(10 * raw); bili, INR, and albumin floored at 1.0",
  "albumin_g_dl": 2.5,
  "inr": 1.5,
  "bilirubin_mg_dl": 4.0,
  "bilirubin_used_mg_dl": 4.0,
  "inr_used": 1.5,
  "albumin_used_g_dl": 2.5,
  "age_lt_1": false,
  "growth_failure": false,
  "peld": 8
}

Client errors (HTTP 400)

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

HTTP Code When
400 invalid_peld_age age_years must be a number from 0 to 11 (PELD is for children under 12). Returned before settlement; you are not charged.
400 invalid_bilirubin bilirubin_mg_dl (0.1-40) or bilirubin_umol_l (2-684) is required Returned before settlement; you are not charged.
400 invalid_albumin albumin_g_dl (1-6) or albumin_g_l (10-60) is required Returned before settlement; you are not charged.
400 invalid_inr inr must be a number from 0.8 to 10 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

  • MELD-Na — Agents must not invent MELD-Na from model memory. This endpoint computes the published OPTN/UNOS 2016 MELD-Na score from creatinine, bilirubin, INR, sodium, and dialysis; pay per request with x402 USDC on Base.
  • Child–Pugh — Compute the Child–Turcotte–Pugh cirrhosis severity score from bilirubin, albumin, INR, encephalopathy, and ascites.

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.