MELD-Na Calculator
Enter current lab values to estimate MELD and MELD-Na scores used in advanced liver disease prioritization.
What is the MELD Sodium score?
The MELD-Na score is an updated version of the MELD (Model for End-Stage Liver Disease) score that includes serum sodium. It is commonly used to estimate disease severity in chronic liver failure and to help prioritize liver transplant allocation.
Sodium matters because hyponatremia (low sodium) is associated with worse outcomes in cirrhosis. Adding sodium improves short-term risk prediction compared with MELD alone in many patients.
Inputs used by this calculator
- Total bilirubin: marker of bile excretion and liver function.
- INR: reflects clotting function and synthetic capacity of the liver.
- Creatinine: kidney function marker, heavily weighted in MELD.
- Sodium: included in MELD-Na to capture additional risk.
- Dialysis status: if present, creatinine is conventionally set to 4.0 mg/dL in MELD calculations.
How the MELD-Na formula works
Step 1: Calculate MELD
The calculator uses the standard logarithmic MELD equation:
MELD = 10 × (0.957 × ln(creatinine) + 0.378 × ln(bilirubin) + 1.12 × ln(INR) + 0.643)
- Minimum value of 1.0 is applied to bilirubin, INR, and creatinine inputs for the log terms.
- Creatinine is capped at 4.0 mg/dL.
- If dialysis is selected, creatinine is set to 4.0 mg/dL.
Step 2: Add sodium correction
Sodium is bounded between 125 and 137 mEq/L for scoring, then applied:
MELD-Na = MELD + 1.32 × (137 − Na) − 0.033 × MELD × (137 − Na)
The final score is rounded to the nearest integer and constrained to the typical 6-40 range.
Quick interpretation guide
| MELD-Na Range | General Severity | Approximate Short-Term Risk Trend |
|---|---|---|
| 6-9 | Lower | Lower near-term risk |
| 10-19 | Moderate | Meaningful increase in risk |
| 20-29 | High | Substantially increased risk |
| 30-39 | Very high | Severe short-term risk |
| 40 | Extremely high | Critical risk profile |
Exact interpretation should be performed by treating hepatology teams and transplant programs.
When to be careful using score calculators
1) Labs can change quickly
MELD-Na is only as accurate as the latest data. In unstable patients, yesterday’s values may no longer represent current risk.
2) Clinical context still matters
Complications like active infection, GI bleeding, encephalopathy, frailty, and nutrition status can significantly influence outcomes but are not fully captured by MELD-Na.
3) Program-specific policies exist
Different regions and transplant centers may apply additional criteria, exception points, or policy updates. Always rely on official transplant protocol guidance.
Frequently asked questions
Is MELD-Na the same as MELD 3.0?
No. MELD-Na and MELD 3.0 are related but not identical scoring frameworks. This page calculates MELD and MELD-Na using the classic sodium-adjusted method.
Why do small sodium changes affect the score?
In advanced cirrhosis, low sodium can reflect severe circulatory and renal stress. The sodium term was introduced to better align score-based risk with observed outcomes.
Can I use this calculator for self-diagnosis?
No. This tool is informational only. If you have liver disease concerns, discuss results with a licensed clinician.
Bottom line
A MELD sodium calculator is useful for understanding liver disease severity trends, but it should be treated as a decision-support aid, not a standalone diagnosis or treatment tool. Use reliable lab data, repeat calculations when status changes, and interpret results in full clinical context.