{"uid":"cap_868n7FmMHhDVNyAn8XaPy","slug":"meld-na-score-calculator-optn-unos-2016-08a8975d","name":"MELD-Na Score Calculator (OPTN/UNOS 2016)","description":"OPTN/UNOS 2016 MELD-Na from creatinine, bilirubin, INR, sodium, and dialysis. Deterministic published score with citation; not a listing recommendation.","url":"https://api.magentlab.com/api/calc/meld_na","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["inr","sodium_mmol_l","dialysis"],"properties":{"inr":{"type":"number","description":"INR (0.8-10). OPTN floors at 1."},"dialysis":{"type":"boolean","description":"Dialysis twice in the last week. true sets creatinine used to 4.0."},"sodium_mmol_l":{"type":"number","description":"Serum sodium in mmol/L (110-160). OPTN clamps 125-137. Applied only when MELD > 11."},"bilirubin_mg_dl":{"type":"number","description":"Total bilirubin in mg/dL (0.1-40). Provide this or bilirubin_umol_l. OPTN floors at 1."},"bilirubin_umol_l":{"type":"number","description":"Total bilirubin in µmol/L. Converted as mg/dL = µmol/L / 17.1."},"creatinine_mg_dl":{"type":"number","description":"Serum creatinine in mg/dL. Provide this or creatinine_umol_l. OPTN floors at 1 and caps at 4."},"creatinine_umol_l":{"type":"number","description":"Serum creatinine in µmol/L."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"path":"/api/calc/meld_na","count":2,"items":[{"inr":1.2,"meld":20,"formula":"optn_meld_na_2016","meld_na":26,"citation":{"id":"optn-meld-na-2016","doi":"10.1053/j.gastro.2006.02.010","title":"Serum sodium predicts mortality in patients listed for liver transplantation; OPTN Policy 9 MELD-Na bounds","source":"Gastroenterology. 2006;130(6):1652-1660; OPTN Policy 9 (2016)","authors":"Biggins SW, Kim WR, Terrault NA, et al.; OPTN/UNOS"},"dialysis":false,"inr_used":1.2,"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.","sodium_mmol_l":128,"bilirubin_mg_dl":4.2,"creatinine_mg_dl":1.9,"formula_expression":"MELD = round(10 * (0.957*ln(Cr) + 0.378*ln(bili) + 1.120*ln(INR) + 0.643)); if MELD > 11, MELD-Na = round(MELD + 1.32*(137-Na) - 0.033*MELD*(137-Na))","sodium_used_mmol_l":128,"bilirubin_used_mg_dl":4.2,"creatinine_used_mg_dl":1.9},{"inr":1.2,"meld":20,"formula":"optn_meld_na_2016","meld_na":26,"citation":{"id":"optn-meld-na-2016","doi":"10.1053/j.gastro.2006.02.010","title":"Serum sodium predicts mortality in patients listed for liver transplantation; OPTN Policy 9 MELD-Na bounds","source":"Gastroenterology. 2006;130(6):1652-1660; OPTN Policy 9 (2016)","authors":"Biggins SW, Kim WR, Terrault NA, et al.; OPTN/UNOS"},"dialysis":false,"inr_used":1.2,"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.","sodium_mmol_l":128,"bilirubin_mg_dl":4.2,"creatinine_mg_dl":1.9,"formula_expression":"MELD = round(10 * (0.957*ln(Cr) + 0.378*ln(bili) + 1.120*ln(INR) + 0.643)); if MELD > 11, MELD-Na = round(MELD + 1.32*(137-Na) - 0.033*MELD*(137-Na))","sodium_used_mmol_l":128,"bilirubin_used_mg_dl":4.2,"creatinine_used_mg_dl":1.9}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_gOj73gJetv44UCYvujvGc","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates the OPTN/UNOS 2016 MELD-Na score from creatinine, bilirubin, INR, sodium, and dialysis status using the published deterministic formula.","exampleAgentPrompt":"Calculate the MELD-Na score for a patient with an INR of 1.9, creatinine of 2.3 mg/dL, bilirubin of 4.1 mg/dL, serum sodium of 130 mmol/L, and not on dialysis.","exampleUseCases":[{"title":"Pre-transplant liver severity assessment","prompt":"I need the MELD-Na score for a cirrhosis patient: INR 2.4, creatinine 1.8 mg/dL, total bilirubin 6.2 mg/dL, sodium 128 mmol/L, and they haven't been on dialysis — what's their OPTN score?"},{"title":"Dialysis patient MELD-Na scoring","prompt":"Calculate MELD-Na for a patient who has been on dialysis twice this week, with INR 1.5, bilirubin 3.0 mg/dL, and serum sodium 134 mmol/L."},{"title":"Hyponatremia impact on MELD score","prompt":"My patient has INR 1.7, creatinine 1.2 mg/dL, bilirubin 2.8 mg/dL, and a sodium of 126 mmol/L — not on dialysis. What does their 2016 OPTN MELD-Na come out to, and does the hyponatremia change the score?"}],"resultDescription":"Returns the computed MELD-Na score as a numeric value, along with intermediate values (floored/clamped inputs per OPTN rules) and the published formula citation. Includes notes on OPTN-specified floors and caps applied to inputs (e.g. creatinine floored at 1, capped at 4; sodium clamped to 125–137 range when MELD > 11).","failureModes":["Missing required parameters (INR, sodium_mmol_l, or dialysis) returns a validation error","Out-of-range values (e.g. sodium outside 110–160, INR outside 0.8–10) may be rejected or clamped per OPTN rules","Neither bilirubin_mg_dl nor bilirubin_umol_l provided returns an error","Neither creatinine_mg_dl nor creatinine_umol_l provided returns an error","Network timeout or payment failure (x402) prevents score retrieval"],"whenToPreferThis":"Use this endpoint when you need a deterministic, citeable OPTN/UNOS 2016 MELD-Na score computed from raw lab values. Prefer it over manual calculation to ensure correct OPTN floor/cap/clamp rules are applied (creatinine floor at 1, cap at 4; dialysis override to 4.0; sodium clamped to 125–137 when MELD > 11). Not a transplant listing recommendation — purely a reproducible scoring computation backed by a published citation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T07:00:08.266Z","isFirstParty":false}