Model for End Stage Liver Disease Na Calculator
Calculate MELD-Na score for liver transplant prioritization including sodium. Enter values for instant results with step-by-step formulas.
Formula
MELD = 10 x (0.957 x ln(Cr) + 0.378 x ln(Bili) + 1.120 x ln(INR) + 0.643)
MELD-Na = MELD + 1.32 x (137 - Na) - 0.033 x MELD x (137 - Na). Sodium is bounded between 125-137 mEq/L. Lab values below 1.0 are set to 1.0. Creatinine is capped at 4.0 mg/dL (set to 4.0 if on dialysis). Final score bounded between 6 and 40.
Worked Examples
Example 1: Compensated Cirrhosis
Problem: A patient with hepatitis C cirrhosis has bilirubin 1.8 mg/dL, creatinine 0.9 mg/dL, INR 1.3, sodium 139 mEq/L. Not on dialysis.
Solution: Creatinine set to 1.0 (minimum)\nMELD = 10 x (0.957 x ln(1.0) + 0.378 x ln(1.8) + 1.120 x ln(1.3) + 0.643)\nMELD = 10 x (0 + 0.222 + 0.294 + 0.643) = 11.6 = 12\nSodium = 139 > 137, bounded to 137\nMELD-Na = 12 + 1.32(137-137) - 0.033(12)(137-137) = 12
Result: MELD: 12 | MELD-Na: 12 | 3-Month Mortality: ~6% | Moderate priority
Example 2: Decompensated Cirrhosis with Hyponatremia
Problem: A patient with alcoholic cirrhosis and ascites has bilirubin 4.5 mg/dL, creatinine 1.8 mg/dL, INR 2.1, sodium 126 mEq/L. Not on dialysis.
Solution: MELD = 10 x (0.957 x ln(1.8) + 0.378 x ln(4.5) + 1.120 x ln(2.1) + 0.643)\nMELD = 10 x (0.563 + 0.569 + 0.832 + 0.643) = 26.1 = 26\nSodium bounded: max(125, min(137, 126)) = 126\nMELD-Na = 26 + 1.32(137-126) - 0.033(26)(137-126)\n= 26 + 14.52 - 9.44 = 31.1 = 31
Result: MELD: 26 | MELD-Na: 31 | 3-Month Mortality: ~52.6% | Highest priority
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How accurate are the results from Model for End Stage Liver Disease Na Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
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How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.
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