Calculate the current UNOS/OPTN base MELD(i) score for end-stage liver disease and transplant allocation: MELD(i) = (0.957·ln(creatinine) + 0.378·ln(bilirubin) + 1.120·ln(INR) + 0.643) × 10, rounded and clamped to 6–40. Creatinine is floored at 1.0, capped at 4.0 mg/dL, and forced to 4.0 if dialyzed ≥2× or on CVVHD ≥24 h in the past week; bilirubin and INR are floored at 1.0. NOTE: in the US, MELD-Na (2016) and then MELD 3.0 (Jul 2023, adds sex and albumin) have superseded this base MELD for adult allocation — this tool implements the classic base MELD(i) for education / non-US use. Derived from Kamath 2001 (Hepatology) and UNOS/OPTN policy. Not medical advice.
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Tool usage guide
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Key facts
Category
Health
Input types
number, checkbox
Output type
json
Sample coverage
4
API ready
Yes
Overview
Calculate the classic UNOS/OPTN base MELD(i) score from serum creatinine, total bilirubin, INR, and recent dialysis status. The result is rounded and limited to 6–40 for educational or non-US use; it is not medical advice.
When to use
Estimate a classic base MELD(i) score for end-stage liver disease using laboratory values.
Review how creatinine, bilirubin, INR, and recent dialysis affect the calculation.
Use the formula for education or contexts where the classic MELD(i), rather than MELD-Na or MELD 3.0, is required.
How it works
1Enter positive values for serum creatinine in mg/dL, total bilirubin in mg/dL, and INR.
2Select the dialysis option if the patient received dialysis at least twice or CVVHD for at least 24 hours during the past week.
3The calculator applies the specified floors and caps: creatinine is limited to 1.0–4.0, while bilirubin and INR are floored at 1.0.
4It applies the base MELD(i) formula, rounds the result, and clamps the score to a range of 6–40.
Use cases
Medical education on the classic MELD(i) formula and its laboratory inputs.
Hepatology review of how dialysis status and value floors or caps change the score.
Non-US or historical analysis requiring the UNOS/OPTN base MELD(i) calculation.
Examples
1. Base MELD(i) without dialysis
Medical student
Background
A medical student is reviewing a case with creatinine 1.5 mg/dL, bilirubin 3.0 mg/dL, and INR 1.8.
Problem
Calculate the classic base MELD(i) score when all laboratory values are above their minimums and dialysis is not present.
How to use
Enter creatinine 1.5, bilirubin 3.0, INR 1.8, and leave dialysis unchecked.