MELD Calculator (Model for End-Stage Liver Disease)

Written by Great Medico

Updated September 24, 2026 •2 min read

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Liver and GI risk tools often combine familiar labs in ways that are not intuitive at a glance. MELD Calculator (Model for End-Stage Liver Disease) makes that relationship explicit and returns the exact index or score implemented in this calculator.

What this calculator does

MELD Calculator (Model for End-Stage Liver Disease) calculates the older MELD-Na score from bilirubin, INR, creatinine, and sodium. It only uses the fields shown in this calculator; it does not silently add tests, diagnoses, symptoms, or clinical variables that are absent from the interface. Uses standard health-calculator relationships where a stable equation exists; complex or policy-dependent tools expose assumptions/points so the result can be checked against the current clinical or public-health source.

How to use it

Enter or select Serum bilirubin, INR, Serum creatinine, and Serum sodium. Keep laboratory units consistent and use values from the clinical time point required by the named model. If an input is unknown, it is better to leave the calculation unresolved than to invent a value.

How the calculation works

This calculator implements MELD-Na. Bilirubin is bounded to 1–40 mg/dL, INR to at least 1, creatinine to 1–4 mg/dL, and sodium to 125–137 mmol/L. It calculates the older base MELD logarithmic equation, applies the MELD-Na sodium adjustment, and bounds the displayed result to 6–40.

Example

Using the calculator’s prefilled demonstration values, the primary output is 17 points, labeled “MELD-Na estimate”; Base MELD is 15.3 and Sodium used is 135 mmol/L. That sample is useful for checking the calculation path, but real interpretation should use verified measurements from the same clinical or study context.

How to interpret the result

The displayed 6–40 number is the calculator’s MELD-Na estimate. It should not be assumed to equal a current transplant allocation score because MELD 3.0 and policy-specific rules can produce a different result.

Limitations and notes

This is MELD-Na, not the current U.S. adult liver-allocation MELD 3.0 calculation, which incorporates additional variables and updated coefficients. Transplant programs also apply policy rules, laboratory windows, dialysis handling, exceptions, and score bounds that are not captured here.