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

MELD Score Calculator

Model for End-Stage Liver Disease (UNOS 2016 Policy Formulation)

Total Bilirubin mg/dL
INR (International Normalized Ratio) Ratio
Serum Creatinine mg/dL
Serum Sodium mEq/L

Clinical Scope of the MELD Scoring Engine

The Model for End-Stage Liver Disease (MELD) is a prospectively derived, validated logarithmic scoring engine designed to gauge the short-term survival probability of patients diagnosed with advanced chronic liver decompensation. Originally utilized to estimate mortality following transjugular intrahepatic portosystemic shunt (TIPS) placement, the tool has been adopted by the Organ Procurement and Transplantation Network (OPTN) to eliminate subjective clinical data variables, replacing them with objective laboratory telemetry metrics to equitably guide donor liver organ allocation rankings.

Core Formula Dynamics & Sodium Modulation

The mathematical calculation architecture depends upon the interplay of four primary biological markers:

  • Total Bilirubin: Represents the liver’s metabolic excretion capacity and clearance integrity.
  • INR (Prothrombin Time): Serves as a precise operational proxy evaluating the functional synthetic capacity of liver tissue to produce vitamin K-dependent coagulation pathway proteins.
  • Serum Creatinine: Monitors glomerular filtration tracking to evaluate secondary renal impairment secondary to hepatorenal syndrome pathophysiology.
  • Serum Sodium: Integrated as a standard correction modifier since 2016 due to the profound impact of dilutional hyponatremia as an independent clinical indicator of refractory ascites, portal hypertension, and mortality risk.