MELD & MELD-Na (Model for End-Stage Liver Disease) Hepatology Score Calculator

Calculate UNOS MELD and MELD-Na (6–40) liver severity score from Bilirubin, INR, Cr, and Na.

UNOS MELD-Na Score
24 points (6–40)
Baseline MELD_i Score (Pre-Sodium) 20 points
Hyponatremia Points Added 4 +points
Exact Unrounded MELD-Na 23.96 points
Inputs
⚡ Scenarios:
mg/dL
Total Serum Bilirubin in mg/dL (floored at 1.0 mg/dL per UNOS rule).
INR
International Normalized Ratio (INR, floored at 1.0).
mg/dL
Serum Creatinine in mg/dL (floored at 1.0, capped at 4.0 mg/dL).
mEq/L
Serum Sodium in mEq/L (bounded between 125 and 137 mEq/L).
Results & Graph
UNOS MELD-Na Score
24 points (6–40)
Baseline MELD_i Score (Pre-Sodium)
20 points
Hyponatremia Points Added
4 +points
Exact Unrounded MELD-Na
23.96 points

UNOS MELD-Na Score

Graph 1 • MELD & MELD-Na Score • Domain Architecture & Live Telemetry Maps Serum Bilirubin Mg Dl, Prothrombin Inr, Serum Creatinine Mg Dl through MELD & MELD-Na Score Formula.
MELD & MELD-Na Score • Clinical & Physiological Reference Scale Low / Baseline Target / Reference Elevated / Watch High / Action UNOS MELD-Na Score: 24 points (6–40) Baseline MELD_i Score (Pre 20 points Hyponatremia Points Added 4 +points Exact Unrounded MELD-Na 23.96 points
Graph 2 • UNOS MELD-Na Score Across Serum Bilirubin Mg Dl Sweep (40% → 160%) Evaluates MELD_i = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10); across 7 operating points (current input highlighted).
0 points 14.30 points 28.60 points 22 1.12mg/dL 22 1.68mg/dL 23 2.24mg/dL 24 2.80mg/dL 25 3.36mg/dL 25 3.92mg/dL 26 4.48mg/dL
Graph 3 • Joint Sensitivity: Serum Bilirubin Mg Dl × Prothrombin Inr Compares UNOS MELD-Na Score when Prothrombin Inr is shifted +25% (solid) vs. −25% (dashed).
0 points 14.85 points 29.70 points --- Prothrombin Inr @ 75% 25 -30% 26 -15% 26 +0% 26 +15% 27 +30%
Summary: Initial MELD_i is 20 and Sodium-Adjusted MELD-Na (at Na+ 131 mEq/L) is 24/40.
Summary: Initial MELD_i is 20 and Sodium-Adjusted MELD-Na (at Na+ 131 mEq/L) is 24/40.
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Formula & Mathematical Methodology: MELD & MELD-Na Score Formula

MELDi = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10)
MELD-Na = MELD + 1.32·(137−Na) − 0.033·MELD·(137−Na)
MELD_i = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10); MELD-Na = MELD + 1.32·(137−Na) − 0.033·MELD·(137−Na)
  • serumBilirubinMgDl: Serum Bilirubin Mg Dl (mg/dL)
  • prothrombinInr: Prothrombin Inr (INR)
  • serumCreatinineMgDl: Serum Creatinine Mg Dl (mg/dL)
  • serumSodiumMeqL: Serum Sodium Meq L (mEq/L)

Rounding: Clinical scores round to statutory integer or decimal precision; physiological metrics round to 2 decimal places.

Worked Example: Clinical / Physiology Scenario: MELD & MELD-Na Score

Calculate UNOS MELD and MELD-Na (6–40) liver severity score from Bilirubin, INR, Cr, and Na.

  1. Enter lab values, anthropometric measurements, or performance test metrics.
  2. Evaluate the reference equation: MELD_i = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10); MELD-Na = MELD + 1.32·(137−Na) − 0.033·MELD·(137−Na).
  3. Inspect the primary classification, supporting indices, and 3 SVG charts.
Result: Computes MELD & MELD-Na Score via MELD_i = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10); MELD-Na = MELD + 1.32·(137−Na) − 0.033·MELD·(137−Na).

Frequently Asked Questions

How does the MELD & MELD-Na (Model for End-Stage Liver Disease) Hepatology Score Calculator compute its result?

It evaluates MELD_i = 0.957·ln(Cr) + 0.378·ln(Bili) + 1.120·ln(INR) + 0.643 (×10); MELD-Na = MELD + 1.32·(137−Na) − 0.033·MELD·(137−Na) directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for a target lab value or pace?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input parameter.

Are my health and biometric inputs kept private?

Yes. All calculations run 100% locally on your device with zero external transmission.

Health & Fitness · Hepatology, GI & Cardiology Scores

MELD & MELD-Na (Model for End-Stage Liver Disease) Hepatology Score Calculator: inputs, method, and how to read the result

Calculate UNOS MELD and MELD-Na (6–40) liver severity score from Bilirubin, INR, Cr, and Na.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Serum Bilirubin Mg Dl: Total Serum Bilirubin in mg/dL (floored at 1.0 mg/dL per UNOS rule).
  • Prothrombin Inr: International Normalized Ratio (INR, floored at 1.0).
  • Serum Creatinine Mg Dl: Serum Creatinine in mg/dL (floored at 1.0, capped at 4.0 mg/dL).
  • Serum Sodium Meq L: Serum Sodium in mEq/L (bounded between 125 and 137 mEq/L).

What the calculation includes

With the default values shown, UNOS MELD-Na Score is 24 points (6–40). The calculation follows MELD & MELD-Na Score Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Serum Bilirubin Mg Dl from 2.8 mg/dL to 3.08 mg/dL changes UNOS MELD-Na Score from 24 points (6–40) to 25 points (6–40). This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses peer-reviewed clinical and sports physiology formulas.
  • For educational and informational reference only; clinical scores do not replace physician judgment or laboratory reference ranges.

Scope: Global Clinical & Sports Science Consensus Check the assumptions and limitations against your situation before relying on the estimate.

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