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PELD-Cr (OPTN Policy 9 Table 9-1)

PELD-Cr

Compute the OPTN Policy 9 Table 9-1 PELD-Cr integer from age, albumin, bilirubin, INR, creatinine or dialysis/CVVHD, and a caller-assigned minimum CDC height or weight Z-score.

LIVE $0.005 USDC GET /api/calc/peld_cr

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

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

What it computes

Compute the OPTN Policy 9 Table 9-1 PELD-Cr integer from age, albumin, bilirubin, INR, creatinine or dialysis/CVVHD, and a caller-assigned minimum CDC height or weight Z-score.

When to use

When an agent needs the published PELD-Cr integer and must not invent a listing order, substitute McDiarmid 2002 PELD, or compute CDC LMS Z from height and weight.

When not to use

Not a medical device.
Not a transplant listing or allocation order.
OPTN Policy 9 Table 9-1 PELD-Cr only. This is not McDiarmid 2002 PELD.
magent does not compute CDC LMS Z-scores from height or weight; min_cdc_z is caller-assigned.
Does not assign exception scores, Status 1A, Status 1B, or listing priority.

Formula

PELD = round((sum of OPTN Policy 9 Table 9-1 terms + 1.5287)*10 + 2.82); min 6. Age (fractional years, <12): <1 → -0.1967*1; 1-5.5 → -0.1967*age; >5.5 → -0.1967*5.5. Albumin g/dL (floor 1.0): 1-1.9 → -1.842*ln(albumin); >1.9 → -1.842*ln(1.9). Bilirubin mg/dL (floor 1.0): 1-4 → 0.7854*ln(bilirubin)+0.3434*ln(4); >4-40 → 0.7854*ln(4)+0.3434*ln(bilirubin); >40 → 0.7854*ln(4)+0.3434*ln(40). INR (floor 1.0): 1-2 → 1.981*ln(INR)+0.7298*ln(2); >2-10 → 1.981*ln(2)+0.7298*ln(INR); >10 → 1.981*ln(2)+0.7298*ln(10). Min CDC height/weight Z: <-5 → -0.1807*(-5); -5 to -2.1 → -0.1807*Z; >-2.1 → -0.1807*(-2.1). Creatinine mg/dL (1.3 if >1.3 or dialysis/CVVHD): <0.2 → 1.453*ln(0.2); 0.2-1.3 → 1.453*ln(creatinine); >1.3 → 1.453*ln(1.3)

Citation

Title: Improving Liver Allocation: MELD, PELD, Status 1A and Status 1B
Authors: Organ Procurement and Transplantation Network
Source: OPTN Policy 9.1.E / Table 9-1 (policy notice June 2022; implementation 13 Jul 2023)
DOI: none

Worked example

Age 2, albumin 2.5, bili 4.0, INR 1.5, creatinine 0.4, Z 0

Given: age_years=2albumin_g_dl=2.5bilirubin_mg_dl=4.0creatinine_mg_dl=0.4dialysis_or_cvvhd=falseinr=1.5min_cdc_z=0.0

Floor albumin, bilirubin, and INR at 1.0. Creatinine 0.4 is between 0.2 and 1.3. Age 2 is in 1-5.5. min_cdc_z 0 is above -2.1 so Z used is -2.1. Albumin 2.5 is above 1.9 so albumin used is 1.9.
Sum Table 9-1 terms: age -0.1967*2; albumin -1.842*ln(1.9); bilirubin 0.7854*ln(4)+0.3434*ln(4); INR 1.981*ln(1.5)+0.7298*ln(2); Z -0.1807*(-2.1); creatinine 1.453*ln(0.4).
PELD-Cr = round((sum + 1.5287)*10 + 2.82); minimum 6.

Also searched as

PELD-Cr
PELD Cr
Pediatric End-Stage Liver Disease creatinine
OPTN PELD 2023
PELD creatinine
updated PELD
Policy 9 PELD

Try

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

/api/calc/peld_cr?age_years=2&albumin_g_dl=2.5&bilirubin_mg_dl=4.0&inr=1.5&creatinine_mg_dl=0.4&dialysis_or_cvvhd=false&min_cdc_z=0.0

Full URL: https://api.magentlab.com/api/calc/peld_cr?age_years=2&albumin_g_dl=2.5&bilirubin_mg_dl=4.0&inr=1.5&creatinine_mg_dl=0.4&dialysis_or_cvvhd=false&min_cdc_z=0.0

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_cr?age_years=2&albumin_g_dl=2.5&bilirubin_mg_dl=4.0&inr=1.5&creatinine_mg_dl=0.4&dialysis_or_cvvhd=false&min_cdc_z=0.0"

Parameters

Name	Type	Required	Description
`age_years`	number	required	Age in fractional calendar years (0 to under 12). Table 9-1 uses 1.0 below age 1 and 5.5 above 5.5 years. PELD-Cr is for candidates under 12.
`albumin_g_dl`	number	optional	Serum albumin in g/dL (0.1-6). Provide this or albumin_g_l, not both. Policy floors at 1.0; Table 9-1 uses ln(1.9) above 1.9.
`albumin_g_l`	number	optional	Serum albumin in g/L (1-60). Converted as g/dL = g/L / 10.
`bilirubin_mg_dl`	number	optional	Total bilirubin in mg/dL (0.1-80). Provide this or bilirubin_umol_l, not both. Policy floors at 1.0; Table 9-1 knots at 4 and 40.
`bilirubin_umol_l`	number	optional	Total bilirubin in µmol/L (2-1368). Converted as mg/dL = µmol/L / 17.1.
`inr`	number	required	INR (0.8-20). Policy floors at 1.0; Table 9-1 knots at 2 and 10.
`creatinine_mg_dl`	number	optional	Serum creatinine in mg/dL (0.1-20). Provide this or creatinine_umol_l, not both. Table 9-1 floors at 0.2 and assigns 1.3 if >1.3 or dialysis_or_cvvhd is true.
`creatinine_umol_l`	number	optional	Serum creatinine in µmol/L (9-1768). Converted as mg/dL = µmol/L / 88.42.
`dialysis_or_cvvhd`	boolean	required	True when the candidate had two or more dialysis treatments in the prior 7 days, or 24 hours of CVVHD in the prior 7 days. Assigns creatinine 1.3 mg/dL.
`min_cdc_z`	number	required	Caller-assigned minimum of CDC 2000 height or weight Z-score (LMS). magent does not compute Z from height or weight. Table 9-1 clamps -5.0 to -2.1.

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_cr 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",
      "creatinine_mg_dl": "0.4",
      "dialysis_or_cvvhd": "false",
      "inr": "1.5",
      "min_cdc_z": "0.0"
    },
    {
      "age_years": "2",
      "albumin_g_dl": "2.5",
      "bilirubin_mg_dl": "4.0",
      "creatinine_mg_dl": "0.4",
      "dialysis_or_cvvhd": "false",
      "inr": "1.5",
      "min_cdc_z": "0.0"
    }
  ]
}

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_cr",
  "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": "Organ Procurement and Transplantation Network",
        "id": "optn-2023-peld-cr",
        "source": "OPTN Policy 9.1.E / Table 9-1 (policy notice June 2022; implementation 13 Jul 2023)",
        "title": "Improving Liver Allocation: MELD, PELD, Status 1A and Status 1B"
      },
      "formula": "optn_peld_cr_2023",
      "formula_expression": "PELD = round((sum of OPTN Policy 9 Table 9-1 terms + 1.5287)*10 + 2.82); min 6. Age (fractional years, <12): <1 → -0.1967*1; 1-5.5 → -0.1967*age; >5.5 → -0.1967*5.5. Albumin g/dL (floor 1.0): 1-1.9 → -1.842*ln(albumin); >1.9 → -1.842*ln(1.9). Bilirubin mg/dL (floor 1.0): 1-4 → 0.7854*ln(bilirubin)+0.3434*ln(4); >4-40 → 0.7854*ln(4)+0.3434*ln(bilirubin); >40 → 0.7854*ln(4)+0.3434*ln(40). INR (floor 1.0): 1-2 → 1.981*ln(INR)+0.7298*ln(2); >2-10 → 1.981*ln(2)+0.7298*ln(INR); >10 → 1.981*ln(2)+0.7298*ln(10). Min CDC height/weight Z: <-5 → -0.1807*(-5); -5 to -2.1 → -0.1807*Z; >-2.1 → -0.1807*(-2.1). Creatinine mg/dL (1.3 if >1.3 or dialysis/CVVHD): <0.2 → 1.453*ln(0.2); 0.2-1.3 → 1.453*ln(creatinine); >1.3 → 1.453*ln(1.3)",
      "age_years": 2.0,
      "albumin_g_dl": 2.5,
      "inr": 1.5,
      "creatinine_mg_dl": 0.4,
      "bilirubin_mg_dl": 4.0,
      "bilirubin_used_mg_dl": 4.0,
      "creatinine_used_mg_dl": 0.4,
      "inr_used": 1.5,
      "albumin_used_g_dl": 1.9,
      "age_used_years": 2.0,
      "dialysis_or_cvvhd": false,
      "min_cdc_z": 0.0,
      "min_cdc_z_used": -2.1,
      "peld_cr": 22
    },
    {
      "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": "Organ Procurement and Transplantation Network",
        "id": "optn-2023-peld-cr",
        "source": "OPTN Policy 9.1.E / Table 9-1 (policy notice June 2022; implementation 13 Jul 2023)",
        "title": "Improving Liver Allocation: MELD, PELD, Status 1A and Status 1B"
      },
      "formula": "optn_peld_cr_2023",
      "formula_expression": "PELD = round((sum of OPTN Policy 9 Table 9-1 terms + 1.5287)*10 + 2.82); min 6. Age (fractional years, <12): <1 → -0.1967*1; 1-5.5 → -0.1967*age; >5.5 → -0.1967*5.5. Albumin g/dL (floor 1.0): 1-1.9 → -1.842*ln(albumin); >1.9 → -1.842*ln(1.9). Bilirubin mg/dL (floor 1.0): 1-4 → 0.7854*ln(bilirubin)+0.3434*ln(4); >4-40 → 0.7854*ln(4)+0.3434*ln(bilirubin); >40 → 0.7854*ln(4)+0.3434*ln(40). INR (floor 1.0): 1-2 → 1.981*ln(INR)+0.7298*ln(2); >2-10 → 1.981*ln(2)+0.7298*ln(INR); >10 → 1.981*ln(2)+0.7298*ln(10). Min CDC height/weight Z: <-5 → -0.1807*(-5); -5 to -2.1 → -0.1807*Z; >-2.1 → -0.1807*(-2.1). Creatinine mg/dL (1.3 if >1.3 or dialysis/CVVHD): <0.2 → 1.453*ln(0.2); 0.2-1.3 → 1.453*ln(creatinine); >1.3 → 1.453*ln(1.3)",
      "age_years": 2.0,
      "albumin_g_dl": 2.5,
      "inr": 1.5,
      "creatinine_mg_dl": 0.4,
      "bilirubin_mg_dl": 4.0,
      "bilirubin_used_mg_dl": 4.0,
      "creatinine_used_mg_dl": 0.4,
      "inr_used": 1.5,
      "albumin_used_g_dl": 1.9,
      "age_used_years": 2.0,
      "dialysis_or_cvvhd": false,
      "min_cdc_z": 0.0,
      "min_cdc_z_used": -2.1,
      "peld_cr": 22
    }
  ]
}

Response

Field	Type	Description
`formula`	string	optn_peld_cr_2023
`formula_expression`	string	Exact Table 9-1 expression used
`age_years`	number	Input age in years
`albumin_g_dl`	number	Input albumin in g/dL
`bilirubin_mg_dl`	number	Input bilirubin in mg/dL
`inr`	number	Input INR
`creatinine_mg_dl`	number	Input creatinine in mg/dL
`dialysis_or_cvvhd`	boolean	Dialysis or 24h CVVHD flag
`min_cdc_z`	number	Caller-assigned minimum CDC height or weight Z
`age_used_years`	number	Age after Table 9-1 1.0-5.5 bounds
`albumin_used_g_dl`	number	Albumin after 1.0 floor and 1.9 Table 9-1 cap
`bilirubin_used_mg_dl`	number	Bilirubin after 1.0 floor and 40 cap
`inr_used`	number	INR after 1.0 floor and 10 cap
`creatinine_used_mg_dl`	number	Creatinine after 0.2 floor; 1.3 if >1.3 or dialysis/CVVHD
`min_cdc_z_used`	number	Minimum CDC Z after Table 9-1 -5.0 to -2.1 clamp
`peld_cr`	integer	OPTN Policy 9 PELD-Cr, nearest integer, minimum 6
`citation`	object	OPTN Policy 9 PELD-Cr 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.",
  "citation": {
    "authors": "Organ Procurement and Transplantation Network",
    "id": "optn-2023-peld-cr",
    "source": "OPTN Policy 9.1.E / Table 9-1 (policy notice June 2022; implementation 13 Jul 2023)",
    "title": "Improving Liver Allocation: MELD, PELD, Status 1A and Status 1B"
  },
  "formula": "optn_peld_cr_2023",
  "formula_expression": "PELD = round((sum of OPTN Policy 9 Table 9-1 terms + 1.5287)*10 + 2.82); min 6. Age (fractional years, <12): <1 → -0.1967*1; 1-5.5 → -0.1967*age; >5.5 → -0.1967*5.5. Albumin g/dL (floor 1.0): 1-1.9 → -1.842*ln(albumin); >1.9 → -1.842*ln(1.9). Bilirubin mg/dL (floor 1.0): 1-4 → 0.7854*ln(bilirubin)+0.3434*ln(4); >4-40 → 0.7854*ln(4)+0.3434*ln(bilirubin); >40 → 0.7854*ln(4)+0.3434*ln(40). INR (floor 1.0): 1-2 → 1.981*ln(INR)+0.7298*ln(2); >2-10 → 1.981*ln(2)+0.7298*ln(INR); >10 → 1.981*ln(2)+0.7298*ln(10). Min CDC height/weight Z: <-5 → -0.1807*(-5); -5 to -2.1 → -0.1807*Z; >-2.1 → -0.1807*(-2.1). Creatinine mg/dL (1.3 if >1.3 or dialysis/CVVHD): <0.2 → 1.453*ln(0.2); 0.2-1.3 → 1.453*ln(creatinine); >1.3 → 1.453*ln(1.3)",
  "age_years": 2.0,
  "albumin_g_dl": 2.5,
  "inr": 1.5,
  "creatinine_mg_dl": 0.4,
  "bilirubin_mg_dl": 4.0,
  "bilirubin_used_mg_dl": 4.0,
  "creatinine_used_mg_dl": 0.4,
  "inr_used": 1.5,
  "albumin_used_g_dl": 1.9,
  "age_used_years": 2.0,
  "dialysis_or_cvvhd": false,
  "min_cdc_z": 0.0,
  "min_cdc_z_used": -2.1,
  "peld_cr": 22
}

Client errors (HTTP 400)

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

HTTP	Code	When
400	`invalid_peld_cr`	PELD-Cr inputs must match OPTN Policy 9 age under 12, albumin, bilirubin, INR, creatinine or dialysis, and caller-assigned minimum CDC height or weight Z-score. 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

PELD — Compute the McDiarmid 2002 Pediatric End-Stage Liver Disease listing arithmetic from bilirubin, INR, albumin, age, and growth failure.
MELD 3.0 — Compute the Kim 2021 MELD 3.0 integer from sex, bilirubin, INR, creatinine, sodium, albumin, and dialysis.
MELD-Na — Compute OPTN/UNOS 2016 MELD and MELD-Na from creatinine, bilirubin, INR, sodium, and dialysis.

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.