MELD Score Calculator
Calculate your Model for End-Stage Liver Disease (MELD) score to assess liver transplant urgency. This tool follows the official UNOS formula for accurate results.
Your MELD Score Results
Comprehensive Guide to Calculating MELD Score
The Model for End-Stage Liver Disease (MELD) score is a numerical scale ranging from 6 to 40 that measures the severity of chronic liver disease. Developed by the Mayo Clinic and adopted by the United Network for Organ Sharing (UNOS) in 2002, the MELD score determines priority for liver transplant allocation in the United States.
How the MELD Score is Calculated
The MELD score uses three laboratory values in its calculation:
- Total bilirubin (mg/dL) – measures how well the liver excretes bile
- INR (International Normalized Ratio) – measures blood clotting ability
- Creatinine (mg/dL) – measures kidney function
The original MELD formula is:
MELD = 3.78 × ln[serum bilirubin (mg/dL)] + 11.2 × ln[INR] + 9.57 × ln[serum creatinine (mg/dL)] + 6.43
In 2016, UNOS updated the formula to include sodium (MELD-Na), which better predicts mortality:
MELD-Na = MELD + 1.32 × (137 – Na) – [0.033 × MELD × (137 – Na)]
Interpreting MELD Score Results
| MELD Score Range | 3-Month Mortality Risk | Transplant Priority |
|---|---|---|
| < 9 | 1.9% | Low priority |
| 10-19 | 6.0% | Moderate priority |
| 20-29 | 19.6% | High priority |
| 30-39 | 52.6% | Urgent priority |
| ≥ 40 | 71.3% | Highest priority |
Clinical Significance of MELD Score
The MELD score serves several critical functions in liver disease management:
- Transplant allocation: Patients with higher MELD scores receive higher priority for donor livers
- Prognostic indicator: Predicts 3-month mortality risk without transplant
- Treatment guidance: Helps determine appropriate interventions based on disease severity
- Clinical trial eligibility: Used as inclusion criteria for liver disease studies
MELD Score vs. Child-Pugh Score
While the MELD score has largely replaced the Child-Pugh score for transplant allocation, both systems remain clinically relevant:
| Feature | MELD Score | Child-Pugh Score |
|---|---|---|
| Components | Bilirubin, INR, Creatinine, Sodium | Bilirubin, Albumin, INR, Ascites, Encephalopathy |
| Range | 6-40 | A (5-6), B (7-9), C (10-15) |
| Objectivity | Fully objective (lab values) | Partially subjective (clinical assessment) |
| Primary Use | Transplant allocation | Disease classification |
| Mortality Prediction | 3-month | 1-2 year |
Limitations of the MELD Score
While the MELD score is highly valuable, clinicians should be aware of its limitations:
- Hepatocellular carcinoma exception: Patients with liver cancer may receive priority points regardless of MELD score
- Pediatric limitations: PELD score is used for children under 12
- Acute liver failure: May not accurately reflect urgency in rapid-onset cases
- Regional variations: Some areas use modified MELD scores with additional factors
- Floor/ceiling effects: Less discriminatory at extreme ends of the scale
Frequently Asked Questions About MELD Scores
How often should MELD scores be updated?
MELD scores are typically updated every 7 days for patients on the transplant waiting list, as lab values can change rapidly in end-stage liver disease.
Can MELD scores be appealed?
Yes, patients can request a MELD exception if they believe their score doesn’t accurately reflect their medical urgency. This requires documentation from their healthcare provider.
What’s the highest MELD score possible?
The maximum MELD score is 40, which corresponds to a 71.3% risk of 3-month mortality without transplant. Scores above 40 are capped at 40 for transplant allocation purposes.
How does dialysis affect the MELD score?
Patients on dialysis twice within a 7-day period receive a fixed creatinine value of 4.0 mg/dL in their MELD calculation, which typically increases their score.