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The Model for End-Stage Liver Disease (MELD) Score Calculator is a validated prognostic scoring system that predicts short-term mortality in patients with chronic liver disease. Originally developed to predict survival after transjugular intrahepatic portosystemic shunt (TIPS) procedures, the MELD score was adopted by the United Network for Organ Sharing (UNOS) in 2002 for prioritizing liver transplant allocation, replacing the Child-Pugh score and subjective waiting time criteria. The MELD score uses three objective laboratory values: serum bilirubin, INR, and serum creatinine.
The MELD formula is: MELD = 10 x [0.957 x ln(Creatinine) + 0.378 x ln(Bilirubin) + 1.120 x ln(INR) + 0.643]. Values are bounded: minimum values for lab inputs are set to 1.0, maximum creatinine is capped at 4.0, and patients on dialysis are assigned a creatinine of 4.0. The final score ranges from 6 to 40. Higher scores indicate more severe liver disease and higher short-term mortality, directly translating to higher priority for liver transplant allocation.
The MELD score has been extensively validated across diverse populations and clinical settings. Three-month mortality correlates strongly with MELD scores: patients with scores below 10 have approximately 1.9% mortality, scores 10-19 have 6.0%, scores 20-29 have 19.6%, and scores 30-39 have 52.6% mortality. Scores of 40 carry over 71% three-month mortality. This predictive ability makes the MELD score invaluable not only for transplant allocation but for general prognostic assessment in any patient with chronic liver disease.
The inclusion of creatinine in the MELD score recognizes the critical prognostic importance of renal function in liver disease. Hepatorenal syndrome, a form of functional renal failure occurring in advanced cirrhosis, dramatically worsens prognosis. The renal component also captures the systemic impact of liver disease on other organ systems. For patients on dialysis, the creatinine is automatically set to 4.0 mg/dL, reflecting the severe prognosis associated with combined hepatic and renal failure requiring dialysis support.
Despite its strengths, the MELD score has recognized limitations. It does not account for certain complications of cirrhosis that significantly impact survival, including refractory ascites, hepatic encephalopathy, recurrent variceal bleeding, hepatopulmonary syndrome, and portopulmonary hypertension. Exception points are granted by UNOS for conditions like hepatocellular carcinoma (HCC) meeting Milan criteria, where the MELD score alone would not adequately reflect transplant urgency. The MELD score also has a relative disadvantage for women, potentially related to differences in creatinine production related to muscle mass.
The MELD score has evolved since its initial implementation. MELD-Na was adopted in 2016 to incorporate serum sodium, addressing the prognostic importance of hyponatremia in cirrhosis. MELD 3.0, introduced in 2022, further refined the formula by adding sex, albumin, and sodium as variables while removing the cap on creatinine for female patients. These iterative improvements reflect ongoing efforts to maximize the accuracy and equity of transplant allocation.
MELD = 10 x [0.957 x ln(Cr) + 0.378 x ln(Bilirubin) + 1.120 x ln(INR) + 0.643]. 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). Score range: 6-40. Higher scores indicate more severe disease and higher transplant priority. Natural logarithms are used.
MELD < 10: Low 3-month mortality (~2%), may not need transplant urgently. MELD 10-19: Moderate severity (~6% mortality). MELD 20-29: Significant disease (~20% mortality), transplant likely beneficial. MELD 30-39: Severe (~53% mortality), urgent transplant needed. MELD 40: Critical (>71% mortality).
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MELD 13 indicates moderate liver disease with ~6% 3-month mortality.
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MELD 28 indicates severe disease warranting urgent transplant evaluation.
The Model for End-Stage Liver Disease score predicts 3-month mortality in chronic liver disease using bilirubin, INR, and creatinine. It is used by UNOS to prioritize liver transplant allocation.
Patients with higher MELD scores receive higher priority for available livers. The score is recalculated regularly: every 7 days for scores >= 25, every 14 days for 19-24, every 30 days for 11-18, and every 90 days for <= 10.
Capping prevents the score from being disproportionately driven by extreme renal failure. Patients on dialysis are assigned creatinine of 4.0 to reflect the severe prognosis of combined liver-renal failure.
MELD-Na adds serum sodium to the MELD calculation, recognizing that hyponatremia (low sodium, often from dilution) independently predicts mortality in cirrhosis. It was adopted by UNOS in January 2016.
MELD 3.0 is the latest iteration (adopted 2022) that adds sex, albumin, and sodium. It removes the creatinine cap for females and addresses sex-based disparities in the original MELD score.
MELD was designed to predict pre-transplant (waitlist) mortality, not post-transplant outcomes. Very high MELD scores (>35-40) may be associated with higher post-transplant mortality due to multi-organ dysfunction.
Exception points are granted for conditions poorly captured by laboratory MELD, including HCC within Milan criteria, hepatopulmonary syndrome, portopulmonary hypertension, familial amyloid polyneuropathy, and certain metabolic conditions.
MELD intentionally uses only objective laboratory values to eliminate subjective assessment variability. Ascites and encephalopathy staging are subjective and were used in the Child-Pugh score, which MELD replaced.
Yes. MELD predicts short-term mortality in any liver disease context and is used to guide timing of surgical interventions, TIPS procedures, and overall prognostic discussions with patients and families.
For transplant listing, frequency depends on score severity. Clinically, recalculation should occur whenever there is a significant change in bilirubin, INR, or creatinine, or at regular follow-up visits.
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