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MELD-Na

Compute OPTN/UNOS 2016 MELD and MELD-Na from creatinine, bilirubin, INR, sodium, and dialysis.

LIVE $0.005 USDC GET /api/calc/meld_na

Markdown: /docs/meld-na.md · Canonical: https://magentlab.com/docs/meld-na

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

What it computes

Compute OPTN/UNOS 2016 MELD and MELD-Na from creatinine, bilirubin, INR, sodium, and dialysis.

When to use

When an agent needs the published MELD-Na arithmetic and must not invent the integer score.

When not to use

• Not a listing recommendation or allocation decision.
• Applies OPTN creatinine/bilirubin/INR floors and sodium clamp (125–137). Dialysis forces creatinine 4.0.
• Does not compute exception scores or MELD 3.0.

Formula

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))

Citation

Title

Serum sodium predicts mortality in patients listed for liver transplantation; OPTN Policy 9 MELD-Na bounds

Authors

Biggins SW, Kim WR, Terrault NA, et al.; OPTN/UNOS

Source

Gastroenterology. 2006;130(6):1652-1660; OPTN Policy 9 (2016)

DOI

10.1053/j.gastro.2006.02.010

Worked example

Try

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

/api/calc/meld_na?creatinine_mg_dl=1.9&bilirubin_mg_dl=4.2&inr=1.2&sodium_mmol_l=128&dialysis=false

Full URL: https://api.magentlab.com/api/calc/meld_na?creatinine_mg_dl=1.9&bilirubin_mg_dl=4.2&inr=1.2&sodium_mmol_l=128&dialysis=false

x402 V2 curl

Expect HTTP 402 and a PAYMENT-REQUIRED header 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/meld_na?creatinine_mg_dl=1.9&bilirubin_mg_dl=4.2&inr=1.2&sodium_mmol_l=128&dialysis=false"

Cursor mcp.json

Intended config for @magent/mcp. This is not npm @x402/fetch (a payment fetch wrapper).

{
  "mcpServers": {
    "magent": {
      "args": [
        "-y",
        "@magent/mcp"
      ],
      "command": "npx",
      "env": {
        "X402_PRIVATE_KEY": "0xYOUR_SPENDING_KEY"
      }
    }
  }
}

Parameters

Response

Example JSON

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

{
  "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Biggins SW, Kim WR, Terrault NA, et al.; OPTN/UNOS",
    "doi": "10.1053/j.gastro.2006.02.010",
    "id": "optn-meld-na-2016",
    "source": "Gastroenterology. 2006;130(6):1652-1660; OPTN Policy 9 (2016)",
    "title": "Serum sodium predicts mortality in patients listed for liver transplantation; OPTN Policy 9 MELD-Na bounds"
  },
  "formula": "optn_meld_na_2016",
  "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))",
  "creatinine_mg_dl": 1.9,
  "bilirubin_mg_dl": 4.2,
  "bilirubin_used_mg_dl": 4.2,
  "creatinine_used_mg_dl": 1.9,
  "dialysis": false,
  "inr": 1.2,
  "inr_used": 1.2,
  "meld": 20,
  "meld_na": 26,
  "sodium_mmol_l": 128.0,
  "sodium_used_mmol_l": 128.0
}

Errors

Related tools

• FIB-4 — Compute the FIB-4 fibrosis index from age, AST, ALT, and platelets.

Also searched as

• MELD-Na
• OPTN MELD-Na
• sodium-adjusted MELD
• UNOS MELD 2016

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. Unpaid valid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. Retry the same URL with PAYMENT-SIGNATURE. Settlement completes before the tool runs. Full handshake and shared payment errors: Payments.

Guarantees

• Invalid query parameters return HTTP 400 before settlement. You are not charged.
• Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
• Execution is timeout-bounded and concurrency-capped.
• Calculator inputs are not persisted. Request logs store path without query.