MELD(i) Score = 10 x (0.957 x Log_e(Serum Creatinine Value) + 0.378 x Log_e(Serum Bilirubin Value) + 1.12 x Log_e(International Normalized Ratio) + 0.643)

If the obtained MELD(i) score > 11, perform additional MELD score calculations as follows:

MELD Score = MELD(i) Score + 1.32 × (137 – Serum Sodium) –  [0.033 × MELD(i) Score × (137 – Serum Sodium)]

Supplementary scoring rules:

• All values are expressed in US units (Serum Creatinine, Serum Bilirubin in mg/dL, Serum Sodium in mEq/L, INR is unitless).
• If Serum Bilirubin, Serum Creatinine, or INR <1.0, set to 1.0.
• If any of the following conditions exist, set Serum Creatinine directly to 4.0:
  • Serum Creatinine > 4.0;
  • Underwent ≥ 2 dialysis treatments in the past week;
  • Underwent 24-hour Continuous Venovenous Hemodialysis (CVVHD) in the past week
• If Serum Sodium < 125 mmol/L, set to 125; if Serum Sodium > 137 mmol/L, set to 137.
• The maximum MELD score is 40.

MELD Score	Three-Month Mortality Risk
≥ 40	90%
30 - 39	72%
20 - 29	19%
10 - 19	6%
≤ 9	2%