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🫀 HEPATOLOGY · GASTROENTEROLOGY · TRANSPLANT

MELD & MELD-Na Score Calculator

Calculate Model for End-Stage Liver Disease (MELD) and MELD-Na scores. Predict 90-day mortality, guide UNOS liver transplant allocation priorities, and assess surgical risk in cirrhosis.

UNOS MELD-Na Aligned90-Day MortalityFloor & Cap Validated
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MELD & MELD-Na Calculator

UNOS Liver Transplant Prioritization

Hepatology
Floor & Cap Rules: Standard MELD applies lower bounds of 1.0 for Bilirubin, INR, and Creatinine. Serum Creatinine is capped at 4.0 mg/dL (or set to 4.0 mg/dL if on dialysis). Sodium is clamped to 125–137 mmol/L.
mg/dL
Values <1.0 rounded to 1.0
ratio
Values <1.0 rounded to 1.0
mg/dL
Floor 1.0, ceiling 4.0 mg/dL
mmol/L
Clamped to 125–137 range

Mathematical Derivation

MELD: 3.78 × ln(Bili) + 11.2 × ln(INR) + 9.57 × ln(Cr) + 6.43
MELD-Na: MELD − Na − [0.025 × MELD × (140 − Na)] + 140
Bounds applied: Bilirubin ≥ 1.0, INR ≥ 1.0, Creatinine 1.0–4.0 mg/dL; Sodium 125–137 mmol/L. Final score clamped between 6 and 40.
📋 Contents — tap to expand
1. MELD Score & 90-Day Mortality2. Why Serum Sodium Matters (MELD-Na)3. MELD 3.0 & Future Directions4. Clinical Uses Beyond Transplantation5. Frequently Asked Questions
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Reviewed by Dr. Sharma, MBBS AFIH

Medical Officer, AAC Clinic · Updated 2026-06-09

1MELD Score — 90-Day Mortality & Waitlist Triage

MELD Score RangeEstimated 3-Month MortalityUNOS Allocation Status & Triage
< 10~1.9%Low severity; managed conservatively in outpatient hepatology clinics.
10 – 19~6.0%Moderate risk; MELD ≥15 is the standard threshold for transplant listing evaluation.
20 – 29~19.6%High mortality; active inpatient monitoring and accelerated listing evaluation.
30 – 39~52.6%Very high risk; urgent waitlist priority and critical care stabilization.
≥ 40>71.3% (up to 90%)Critical decompensation; immediate highest allocation priority (Status 1A candidate).

2Why Serum Sodium Matters (MELD-Na)

In advanced cirrhosis, severe splanchnic arterial vasodilatation triggers intense compensatory activation of the renin-angiotensin-aldosterone system (RAAS), the sympathetic nervous system, and non-osmotic hypersecretion of vasopressin (ADH). This causes persistent free water retention, presenting biochemically as hypervolemic hyponatremia.

Extensive multicenter studies proved that cirrhotics with identical MELD scores but lower serum sodium suffer significantly higher 90-day waitlist mortality. In January 2016, UNOS formally adopted MELD-Na as the national standard for deceased donor liver allocation. A cirrhotic with a base MELD of 21 and a serum sodium of 126 mmol/L receives a MELD-Na score of 27, correctly advancing their allocation priority.

3MELD 3.0 & Sex Equity in Transplantation

Introduced in 2021 by Kim et al., MELD 3.0 was developed to address structural disparities: female liver transplant candidates historically experienced higher waitlist mortality because their lower baseline muscle mass produced lower serum creatinine values for equivalent renal impairment. MELD 3.0 incorporates serum albumin, interaction terms, and an explicit female-sex correction coefficient (+1.33 points), improving predictive concordance.

4Clinical Applications Beyond Transplantation

  • Perioperative Surgical Risk in Cirrhosis: MELD is superior to Child-Pugh in predicting 30-day postoperative surgical mortality. MELD <10 carries ~4% mortality; MELD 10–15 carries ~9%; MELD >15 carries >25%. Elective surgeries are contraindicated when MELD >20.
  • Severe Alcoholic Hepatitis: Evaluated in tandem with the Maddrey Discriminant Function (MDF). A MELD score >20 on admission indicates severe alcoholic hepatitis with high 28-day mortality, supporting corticosteroid therapy if active infection is ruled out.
  • Acute Variceal Bleeding: An admission MELD ≥19 independently predicts treatment failure and 6-week mortality following acute variceal hemorrhage, identifying candidates who benefit from early preemptive TIPS within 72 hours.

5Frequently Asked Questions

What is a dangerous MELD score?+
A MELD score ≥15 is the internationally accepted threshold for liver transplant evaluation, where the survival benefit of transplantation outweighs waitlist operative risks. Scores of 20–29 carry ~20% 90-day mortality; ≥30 carries >50% mortality; and ≥40 carries >70%–90% 3-month mortality without urgent graft replacement.
How is hemodialysis factored into the MELD calculation?+
Per UNOS policy, if a patient has undergone hemodialysis, peritoneal dialysis, or CVVH at least twice within the past 7 days, their serum creatinine value is automatically locked to 4.0 mg/dL. This ensures that post-dialysis clearance does not falsely lower the MELD score.
Why are floor values of 1.0 used in MELD?+
Because the MELD equation uses natural logarithms (ln), any laboratory value below 1.0 produces a negative logarithmic number (e.g., ln(0.6) = −0.51). A negative value would paradoxically subtract points and artificially depress the score. Any laboratory result <1.0 is set to 1.0.
Medical Disclaimer: This clinical calculator is designed for qualified healthcare professionals. MELD and MELD-Na scores provide mathematical survival probabilities to aid organ triage. Clinical decisions must account for transplant exception points (e.g., hepatocellular carcinoma Milan criteria, hepatopulmonary syndrome) and individualized multidisciplinary evaluation.