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Calculator: MELD/MELDNa scores (for liver transplantation listing purposes, not appropriate for patient under age 12 years) (SI units)*

Calculator: MELD/MELDNa scores (for liver transplantation listing purposes, not appropriate for patient under age 12 years) (SI units)*

Serum Na  
Hemodialysis twice or ≥24 hours of CVVHD in the past week Yes


Important: Inputs must be complete to perform calculation.

MELD score  
MELDNa score  


  • The model for end-stage liver disease (MELD) score is used to estimate relative disease severity and likely survival of adult patients awaiting liver transplantation.
  • The MELDNa score system adds a Serum Na parameter, so the added risk of significant hyponatremia may be taken into account.
  • Hyponatremia contributes to the MELDNa score only when the initial MELD score is greater than 11.
  • The default setting for the choice "Hemodialysis twice or ≥24 hours of CVVHD in the past week" is "No."
  • If a patient has had 2 or more hemodialysis treatments or ≥24 hours of CVVHD in the week prior to the time of the scoring, Creatinine will be set to 353.6 mcmol/L, which is the maximum creatinine level allowed in the model.
  • For patients with hepatocellular carcinoma, the MELD score is increased according to an algorithm established by the United Network for Organ Sharing (UNOS).
  • When used for liver transplantation listing, UNOS/Organ Procurement and Transplantation Network (OPTN) sets the upper limit for the MELD score at 40.
  • Additional information about the MELD scores is at the UNOS website,
  • INR: international normalized ratio; Serum Na: serum sodium concentration; CVVHD: continuous venovenous hemodialysis.
  • Please refer to appropriate UpToDate topic reviews for further information.
  • * This calculator uses SI units (Système international d'unités) as the default for inputs. Do not use this calculator if you are using conventional units (also known as US units and gravimetric units); please refer instead to the conventional units version of this calculator.

Equations used
MELD_score = (Round the following expression to the nearest integer)((9.57 * ln(Creatinine/88.4)) + (3.78 * ln(Bilirubin/17.1)) + (11.2 * ln(INR)) + 6.43)
MELDNa_score = MELD_score + ((1 if the following expression is true, 0 if false)(MELD_score > 11)) * ((1.32 * (137 - Serum_Na)) - (0.033 * MELD_score * (137 - Serum_Na)))


Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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Topic 16499 Version 17.0