MELD Score Calculator

MELD Score Calculator for Gastroenterology. Higher scores track directly with short-term mortality. Approximate untreated 90-day mortality runs near 2 percent below 9, about 6 percent at 10-19, roughly 20 percent at 20-29, about 50 percent at 30-39, and over 70 percent at 40. In the original validation a score of 40 was the practical ceiling. Scores are dynamic and should be re-measured frequently as disease progresses; a rising trajectory over days to weeks is often more actionable than a single value. In most US programs a MELD of about 15 is the threshold below which transplant survival benefit becomes marginal, so listing and evaluation intensify around and above that point.

How this calculator works

MELD is a logarithmic regression score computed from three objective labs: serum bilirubin, serum creatinine, and INR. The original formula is 3.78×ln(bilirubin mg/dL) + 11.2×ln(INR) + 9.57×ln(creatinine mg/dL) + 6.43, rounded to an integer and capped to a 6-40 range. Each lab is floored at 1.0 before the log to avoid negative contributions, and creatinine is capped at 4.0 mg/dL (patients dialyzed twice in the prior week are assigned creatinine 4.0). The allocation version MELD-Na adds sodium: MELD-Na = MELD + 1.32×(137 - Na) - [0.033×MELD×(137 - Na)], with sodium bounded to 125-137 mmol/L.

When to use this calculator

Use MELD to stratify 90-day mortality risk in adults (age 12 and up) with chronic liver disease, to prioritize candidates on the deceased-donor liver transplant waiting list, and to time referral and interventions in decompensated cirrhosis. It also informs perioperative risk before non-transplant surgery and pre-TIPS assessment. Do not apply it to acute liver failure, to children under 12 (use PELD), or as the sole determinant in patients who qualify for standardized MELD exceptions such as hepatocellular carcinoma, hepatopulmonary syndrome, or portopulmonary hypertension, where the calculated physiologic score understates true urgency.

Inputs used

  • Bilirubin
  • INR
  • Creatinine
  • Dialysis status when applicable

Clinical interpretation

Higher scores track directly with short-term mortality. Approximate untreated 90-day mortality runs near 2 percent below 9, about 6 percent at 10-19, roughly 20 percent at 20-29, about 50 percent at 30-39, and over 70 percent at 40. In the original validation a score of 40 was the practical ceiling. Scores are dynamic and should be re-measured frequently as disease progresses; a rising trajectory over days to weeks is often more actionable than a single value. In most US programs a MELD of about 15 is the threshold below which transplant survival benefit becomes marginal, so listing and evaluation intensify around and above that point.

Worked example

A cirrhotic candidate with bilirubin 4.0 mg/dL, INR 1.8, creatinine 1.5 mg/dL, and sodium 130 mmol/L: original MELD works out to roughly 21. Adding hyponatremia via MELD-Na raises the score by about 8 points to roughly 29, moving the patient from a moderate-risk band to a high-priority band and materially improving position on the transplant list. This example shows why a low sodium can dramatically escalate allocation priority even when the core three labs are only moderately deranged.

Limitations and safety notes

MELD deliberately omits ascites, encephalopathy, and variceal bleeding, so it can understate acutely ill patients whose danger is not captured by the three labs. Creatinine makes it sex-biased, systematically disadvantaging women who have lower muscle mass and thus lower creatinine for the same renal function; the MELD 3.0 revision adds sex and albumin to correct this. Values are distorted by non-hepatic factors: warfarin or vitamin K deficiency inflates INR, hemolysis or Gilbert syndrome alters bilirubin, and recent dialysis or rhabdomyolysis skews creatinine. It does not apply to acute liver failure and does not on its own capture cancer, pulmonary, or hepatopulmonary indications that require exception points.

Frequently asked questions

What is the difference between MELD, MELD-Na, and MELD 3.0?

Original MELD (2001) uses only bilirubin, creatinine, and INR. MELD-Na (adopted by UNOS in 2016) adds serum sodium, since hyponatremia independently predicts death. MELD 3.0 (adopted by UNOS/OPTN in 2023) further adds female sex and albumin and refines the interaction terms to reduce the disadvantage women faced under earlier versions.

Why is creatinine capped at 4.0 and set to 4.0 for dialysis patients?

The relationship between creatinine and mortality flattens at high values, and dialysis artificially lowers measured creatinine. Capping at 4.0 mg/dL, and assigning 4.0 to anyone dialyzed at least twice in the prior week, prevents the score from being gamed or blunted by renal replacement therapy while still crediting the renal component fully.

What MELD score is generally needed to be listed for transplant?

Most US programs consider a MELD around 15 the threshold where the survival benefit of transplant outweighs the risk, so formal listing and evaluation typically intensify at or above this value. Patients below 15 are usually monitored, though exception criteria (for example hepatocellular carcinoma) can grant priority independent of the physiologic score.

Why do the lab values get floored at 1.0?

The formula takes the natural log of each lab, and values below 1.0 would produce negative logarithms that could paradoxically lower the score. Setting any of bilirubin, INR, or creatinine below 1.0 up to 1.0 keeps each term non-negative and preserves the intended monotonic relationship between worsening labs and higher scores.

References

  • Kamath PS, Wiesner RH, Malinchoc M, Kremers W, Therneau TM, Kosberg CL, D'Amico G, Dickson ER, Kim WR. A model to predict survival in patients with end-stage liver disease. Hepatology. 2001. PMID: 11172350.
  • Biggins SW, Kim WR, Terrault NA, Saab S, Balan V, Schiano T, Benson J, Therneau T, Kremers W, Wiesner R, Kamath P, Klintmalm G. Evidence-based incorporation of serum sodium concentration into MELD. Gastroenterology. 2006. PMID: 16697729.
  • Kim WR, Biggins SW, Kremers WK, Wiesner RH, Kamath PS, Benson JT, Edwards E, Therneau TM. Hyponatremia and mortality among patients on the liver-transplant waiting list. N Engl J Med. 2008. PMID: 18768945.
  • Organ Procurement and Transplantation Network (OPTN). Policy 9: Allocation of Livers and Liver-Intestines. 2023.

Editorial review and citation methodology

Reviewed by the Quick Medical Calculator Editorial Team. Last reviewed: March 4, 2026. The review checks calculator inputs, intended population, interpretation, limitations, and source alignment.

  • Prefer original validation studies for scoring systems and prediction tools.
  • Use current specialty society guidance, transplant allocation policy, public health guidance, or regulator resources when they govern clinical use.
  • Include limitations and safety notes when a calculator is population-specific, context-dependent, or unsuitable as a standalone decision tool.

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