MELD / MELD-Na Calculator
Enter current lab values to estimate MELD and MELD-Na scores used in advanced liver disease assessment and liver transplant priority discussions.
Educational tool only. Clinical decisions must be made by qualified healthcare professionals.
What is the MELD score?
The Model for End-Stage Liver Disease (MELD) score is a lab-based severity index used to estimate short-term mortality risk in patients with advanced liver disease. It is commonly used in transplant medicine to help prioritize patients on liver transplant waiting lists.
Because sodium imbalance strongly affects outcomes in cirrhosis, many systems now also use MELD-Na, which adjusts MELD based on serum sodium. In practical terms, MELD-Na often provides better risk stratification for people with decompensated cirrhosis.
Inputs used in this calculator
Required values
- Total bilirubin: Reflects how well the liver clears bile pigments.
- INR: Measures blood clotting tendency and indirectly indicates hepatic synthetic function.
- Creatinine: Represents kidney function, a major predictor of outcomes in advanced liver disease.
- Sodium: Included in MELD-Na because hyponatremia is linked with worse prognosis.
Dialysis adjustment
If recent dialysis criteria are met, transplant scoring rules typically set creatinine to 4.0 mg/dL for calculation purposes. This calculator includes a checkbox for that scenario.
Formula used
This page applies commonly used UNOS-style bounds and formulas:
- Lower bounds: bilirubin, INR, and creatinine are floored at 1.0 for log calculations.
- Creatinine is capped at 4.0 mg/dL.
- Sodium is bounded to 125-137 mEq/L for MELD-Na.
- Final scores are limited to 6-40.
How to interpret the result
Higher scores indicate greater short-term mortality risk and usually greater urgency for specialty follow-up. A quick educational interpretation:
- MELD-Na 6-9: Lower short-term risk (relative to higher groups).
- 10-19: Moderate risk; close monitoring is often needed.
- 20-29: High risk; urgent hepatology care is important.
- 30-39: Very high risk with significant short-term concern.
- 40: Extreme risk category.
These bands are broad educational ranges, not a substitute for full clinical evaluation.
Why MELD-Na matters in cirrhosis care
In decompensated cirrhosis, kidney dysfunction, coagulopathy, jaundice, and sodium disturbances often interact. MELD-Na captures several of these factors in one objective score, helping teams discuss transplant priority, expected trajectory, and timing of interventions.
However, a number cannot summarize the entire patient story. Clinical context still matters: infections, gastrointestinal bleeding, encephalopathy, refractory ascites, nutritional status, frailty, and comorbid disease all influence real-world outcomes.
Limitations and safety notes
- MELD and MELD-Na are population-based risk models; they are not perfect for individual prediction.
- Lab timing and temporary illness (e.g., dehydration, infection) can shift results significantly.
- This tool does not diagnose liver disease or determine transplant eligibility by itself.
- Always use local transplant center protocols and clinician judgment.
Frequently asked questions
Is MELD the same as Child-Pugh?
No. Child-Pugh includes clinical features like ascites and encephalopathy plus lab values. MELD is more lab-centric and is widely used for allocation systems.
Can I use this calculator for children?
Pediatric liver disease typically uses different scoring systems (such as PELD). Use age-appropriate tools and specialist guidance.
How often should MELD-Na be recalculated?
That depends on disease severity and care setting. In advanced disease, clinicians may repeat labs frequently to track trajectory and transplant priority changes.
Bottom line
This meld score calculator is a practical educational resource for understanding how bilirubin, INR, creatinine, sodium, and dialysis status influence MELD and MELD-Na. For decisions about prognosis, treatment, and liver transplant listing, always consult a hepatology or transplant team.