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

Original MELD (2001) uses creatinine, bilirubin, and INR. MELD-Na (2016) adds serum sodium. MELD 3.0 (2022) further adds a +1.33 sex-based adjustment for female patients to correct a documented survival disparity on the waitlist.

What score triggers transplant listing?

UNOS/OPTN uses MELD ≥ 15 as a threshold where transplant benefit generally exceeds risk. Higher scores (≥ 25–30) indicate high urgency. Exact policies vary by transplant center and region.

What are the input value limits used in the formula?

Creatinine is limited to 1.0–3.0 mg/dL, bilirubin and INR have a minimum of 1.0, sodium is limited to 125–137 mmol/L, and albumin to 1.5–3.5 g/dL. Creatinine is set to 3.0 when the OPTN recent-dialysis rule applies.

Can this calculate an adolescent MELD score?

No. This implementation is for candidates registered at age 18 or older. OPTN uses a different constant and no female-sex term for candidates registered before age 18.

Why does the formula include a constant of 6?

The adult equation in OPTN Policy 9.1.D explicitly ends with +6. This intercept is part of the equation; it is separate from the rule that limits the final rounded score to the range 6–40.

Is this calculator a substitute for clinical judgment?

No. This tool is for educational and informational purposes only. Organ allocation decisions must be made by qualified transplant teams using official UNOS/OPTN systems and complete clinical context.

How is the 90-day mortality estimate derived?

The mortality ranges shown are published approximations from the original MELD validation literature. MELD 3.0 was validated to improve predictive accuracy vs MELD-Na, but exact per-score mortality varies by patient population and era.

MELD 3.0 Score Calculator

Enter an adult candidate’s lab values, dialysis status, and sex to estimate the current OPTN MELD score.

Lab Values

Serum Creatinine (mg/dL)

Clamped to 1.0–3.0 mg/dL per formula

Total Bilirubin (mg/dL)

Minimum clamped to 1.0 mg/dL per formula

INR (International Normalized Ratio)

Minimum clamped to 1.0 per formula

Serum Sodium (mmol/L)

Clamped to 125–137 mmol/L per formula

Serum Albumin (g/dL)

Clamped to 1.5–3.5 g/dL per OPTN policy

At least 2 dialysis treatments or 24 hours of continuous dialysis in the prior 7 days

When checked, creatinine is set to 3.0 mg/dL.

Sex Assigned at Birth

Male Female (+1.33 adjustment)

Clinical Disclaimer: This calculator is for educational and informational purposes only. It does not constitute medical advice or replace clinical judgment. Organ allocation must be performed through official UNOS/OPTN systems by qualified transplant professionals.

Summary

The MELD 3.0 (Model for End-Stage Liver Disease) score is an updated formula used by transplant centers to rank patients on the liver transplant waiting list. It improves on the original MELD and MELD-Na by incorporating a sex-based adjustment that reduces the historical disparity in waitlist mortality for female patients. Higher scores indicate more severe liver disease and greater urgency for transplantation.

How it works

Enter the adult candidate's most recent creatinine, sodium, bilirubin, INR, and albumin values.
Indicate whether the OPTN dialysis rule applies: at least two dialysis treatments or 24 hours of continuous dialysis within the prior seven days.
Select the patient's sex assigned at birth (female patients receive a +1.33 adjustment in MELD 3.0).
The calculator applies the published MELD 3.0 formula, clamping each value within its clinical reference range.
The adult score is rounded to the nearest integer and limited to the OPTN range of 6–40.
Use the result as a clinical reference — always confirm values and interpretation with a transplant specialist.

Use cases

Estimate urgency for liver transplant listing and organ allocation.
Monitor disease progression in patients with cirrhosis over serial lab draws.
Quickly assess MELD 3.0 during transplant hepatology consultations.
Compare MELD 3.0 to MELD and MELD-Na to understand the sex-equity adjustment.
Medical education and board exam preparation for hepatology topics.
Triage support in liver failure or acute-on-chronic liver disease.

Frequently Asked Questions

Last updated: 2026-09-30 · Reviewed by Nham Vu