# PELD Status: LIVE Price: $0.005 USDC `GET /api/calc/peld` HTML: https://magentlab.com/docs/peld Markdown: https://magentlab.com/docs/peld.md 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 Development of a pediatric end-stage liver disease score to predict poor outcome in children awaiting liver transplantation McDiarmid SV, Anand R, Lindblad AS; SPLIT Research Group Transplantation. 2002;74(2):173-181 DOI: [10.1097/00007890-200207270-00006](https://doi.org/10.1097/00007890-200207270-00006) ## Worked example ### Age 2, bili 4.0, INR 1.5, albumin 2.5, no growth failure Given: `age_years=2, albumin_g_dl=2.5, bilirubin_mg_dl=4.0, growth_failure=false, inr=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) ## Parameters - `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. Price is n times the GET unit. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/peld` Max items: 25 Price: unit_amount * n (unit 5000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - 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: ```json { "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" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/peld Example 200: ```json { "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.", "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", "age_years": 2.0, "albumin_g_dl": 2.5, "bilirubin_mg_dl": 4.0, "inr": 1.5, "bilirubin_used_mg_dl": 4.0, "inr_used": 1.5, "age_lt_1": false, "albumin_used_g_dl": 2.5, "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.", "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", "age_years": 2.0, "albumin_g_dl": 2.5, "bilirubin_mg_dl": 4.0, "inr": 1.5, "bilirubin_used_mg_dl": 4.0, "inr_used": 1.5, "age_lt_1": false, "albumin_used_g_dl": 2.5, "growth_failure": false, "peld": 8 } ] } ``` ## Response fields - `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 Frozen fixture. Not a live lookup. ```json { "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": "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", "age_years": 2.0, "albumin_g_dl": 2.5, "bilirubin_mg_dl": 4.0, "inr": 1.5, "bilirubin_used_mg_dl": 4.0, "inr_used": 1.5, "age_lt_1": false, "albumin_used_g_dl": 2.5, "growth_failure": false, "peld": 8 } ``` ## Errors - HTTP 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. - HTTP 400 `invalid_bilirubin`: bilirubin_mg_dl (0.1-40) or bilirubin_umol_l (2-684) is required Returned before settlement; you are not charged. - HTTP 400 `invalid_albumin`: albumin_g_dl (1-6) or albumin_g_l (10-60) is required Returned before settlement; you are not charged. - HTTP 400 `invalid_inr`: inr must be a number from 0.8 to 10 Returned before settlement; you are not charged. - HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. - HTTP 402 `payment_required`: Missing or invalid PAYMENT-SIGNATURE; decode the PAYMENT-REQUIRED header - HTTP 409 `payment_in_progress`: The same authorization nonce is already being settled; retry shortly - HTTP 429 `rate_limited`: Too many requests from this client - HTTP 503 `settlement_uncertain`: Settlement is unconfirmed; retry with the same PAYMENT-SIGNATURE - HTTP 503 `settle_failed`: Settlement failed; retry with the same PAYMENT-SIGNATURE shortly - HTTP 503 `facilitator_unavailable`: Payment facilitator unavailable - HTTP 503 `facilitator_misconfigured`: Payment facilitator is not configured - HTTP 503 `facilitator_unauthorized`: Payment facilitator rejected credentials - HTTP 503 `ledger_unavailable`: Payment ledger unavailable - HTTP 503 `payment_unavailable`: Payment processing unavailable ## Related tools - [MELD-Na](https://magentlab.com/docs/meld-na) — Compute OPTN/UNOS 2016 MELD and MELD-Na from creatinine, bilirubin, INR, sodium, and dialysis. - [Child–Pugh](https://magentlab.com/docs/child-pugh) — Compute the Child–Turcotte–Pugh cirrhosis severity score from bilirubin, albumin, INR, encephalopathy, and ascites. ## Also searched as - PELD - Pediatric End-Stage Liver Disease - McDiarmid PELD - pediatric MELD - PELD score ## Payment Required query parameters must be present and valid. 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. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign EIP-3009 (scheme exact, assetTransferMethod eip3009) with validBefore = now + accepts[0].maxTimeoutSeconds (600 seconds). That window starts when you sign and must cover wallet confirmation plus CDP verify and settle. Magent retries transient facilitator 429/5xx before answering. Do not send upto or batch-settlement payloads; magent does not offer those schemes. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON echoing accepted, payload, and extensions when present). - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. Settlement happens before the tool runs. HTTP 503 settlement_uncertain or settle_failed: retry the same PAYMENT-SIGNATURE. Mint a new nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. - not offered `batch-settlement`: Not offered. Payment-channel vouchers claimed later in batches. Not the same as POST {items} bulk (that is still exact). Same-path POST {items} is still scheme exact: one EIP-3009 authorization for n times the GET unit. That is not x402 batch-settlement (payment channels / vouchers). ## Guarantees - Invalid query parameters return HTTP 400 before settlement. You are not charged. - Settlement finishes before the tool executes (paymentFlow upfront). 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.