MELD Score Calculator

Introduction: Understanding Original MELD, MELD-Na, and MELD 3.0

The Model for End-Stage Liver Disease, commonly called MELD, uses laboratory measurements to estimate short-term mortality risk in advanced liver disease. This calculator is educational only: it does not produce the full current transplant-allocation score, and transplant eligibility or priority must be determined through official systems and a transplant team.

Original MELD on this page uses three laboratory values: serum bilirubin, international normalized ratio (INR), and serum creatinine. Bilirubin is related to the liver's handling of bile, INR measures clotting tendency, and creatinine is an indicator of kidney function. The calculator applies the following Original MELD expression before applying its displayed-score bounds:

Formula: MELD = 3.78 ⁢ ln(bilirubin) + 11.2 ⁢ ln(INR) + 9.57 ⁢ ln(creatinine) + 6.43

Because the formula contains logarithms, this calculator uses 1.0 whenever entered bilirubin, INR, or creatinine is below 1.0. For Original MELD and MELD-Na, qualifying recent dialysis sets creatinine to 4.0 mg/dL. MELD-Na incorporates sodium, while MELD 3.0 incorporates sodium, albumin, sex, and its own dialysis treatment. After calculation, every displayed score is limited to the range from 6 to 40.

Interpreting MELD, MELD-Na, and MELD 3.0 Results

A MELD-family result from this calculator is a formula-based estimate of illness severity, not a diagnosis, prognosis for an individual, or a transplant-list decision. A higher result generally reflects more severe abnormalities in the laboratory inputs used by the selected model, but results from different versions should be identified by their model rather than treated as interchangeable.

MELD focuses on selected laboratory markers and short-term risk estimation; it does not describe every aspect of a person's health, symptoms, or future quality of life. A clinician may need to consider infections, malignancy, the cause of liver disease, treatment changes, procedural issues, and other clinical findings alongside laboratory results. The decimal score shown here is useful for learning how the selected formula responds to entered values, not for making care decisions alone.

Role of Creatinine and Dialysis in MELD Scoring

Creatinine and the dialysis checkbox have a direct, model-specific effect in this MELD calculator. In Original MELD and MELD-Na, the formula uses the larger of entered creatinine and 1.0 mg/dL unless the stated dialysis condition is selected, in which case it uses 4.0 mg/dL. In MELD 3.0, it uses the larger of entered creatinine and 1.0 mg/dL, or 3.0 mg/dL when dialysis is selected.

This handling means that kidney function and dialysis status can materially change a MELD result. Select dialysis only when the page's stated condition applies: dialysis at least twice in the prior week or 24 hours of CVVHD. A hepatology or transplant clinician should interpret the laboratory timing, dialysis history, exceptions, and the official rules applicable to an individual case.

Timely Laboratory Testing for MELD Inputs

MELD calculations depend on the bilirubin, INR, creatinine, sodium, and albumin values entered for the selected version, so the date and clinical context of those labs matter. Results can change when laboratory values change, and using values from different times may not represent the same clinical picture. This page cannot determine whether a particular set of results is appropriate for clinical use.

For MELD-Na and MELD 3.0, sodium is required and this calculator constrains it to 125 through 137 mEq/L. MELD 3.0 also requires albumin and constrains it to 1.5 through 3.5 g/dL. Checking the units shown next to each input and confirming the laboratory report with a clinician helps avoid entering a value from the wrong test or scale.

Putting a MELD Calculation in Liver-Disease Context

MELD variants provide structured views of specific laboratory abnormalities in advanced liver disease, but no MELD calculation captures the entire clinical situation. Official allocation processes can involve policy requirements, exceptions, and clinician review that are not reproduced by this educational page.

Conversations about a MELD result may also include the cause of liver disease, other illnesses, symptoms, treatment goals, and available support. For patients and caregivers, understanding which labs feed a selected MELD version can make discussions with the care team more informed without turning an online result into a personal treatment recommendation.

How to use: Entering MELD Laboratory Values

To calculate a MELD variant, first select Original MELD, MELD-Na, or MELD 3.0, then enter positive bilirubin, INR, and creatinine values. Add sodium for MELD-Na. For MELD 3.0, enter sodium and albumin, select the sex used for the MELD 3.0 coefficient, and indicate whether the stated dialysis condition applies.

Source/model metadata: Original MELD, MELD-Na, and MELD 3.0 published model formulas and OPTN/UNOS allocation context. Effective model years: Original MELD 2002, MELD-Na 2016, MELD 3.0 2023. AgentCalc page review date: May 13, 2026. Limitation: this educational formula comparison is not an official clinical score or allocation determination; clinician-managed verification is required.

Final Considerations for Using a MELD Score

MELD results should be discussed with the liver-care professionals responsible for the patient's evaluation, such as hepatology or transplant clinicians. The calculator can show how its selected formula responds to laboratory inputs, but it cannot assess symptoms, validate a laboratory report, determine candidacy, or replace a medical team's judgment. Keeping the score version and input values together is especially important when reviewing a result with a clinician.

Worked example: checking how an INR change affects MELD

For an educational MELD comparison, select one score version, enter a consistent set of laboratory values, and note the displayed result. Then change only INR and calculate again. Comparing those two same-version results isolates the effect of INR in this calculator rather than mixing changes in several laboratory values or score models.

Limitations and assumptions for this MELD score calculator

This calculator applies the formulas coded on this page, including its input floors, sodium and albumin bounds, dialysis values, and final score range, so it does not represent every clinical or allocation-specific situation. Its educational result depends on correctly entered laboratory units, the chosen MELD version, and an accurate dialysis selection. Official transplant policy, clinical interpretation, and source information can change and must be verified through the relevant clinician-managed process.