MELD & MELD-Na Calculator
Use this tool for a quick meld calculo (MELD calculation). Enter lab values below and click calculate.
Educational use only. This does not replace clinical judgment or professional medical advice.
What is MELD and why people search for “meld calculo”
The MELD score (Model for End-Stage Liver Disease) is a clinical scoring system used to estimate the severity of chronic liver disease. In day-to-day practice, it helps clinicians assess short-term mortality risk and prioritize liver transplant candidates. If you are looking up meld calculo, you are usually trying to quickly estimate this score from common lab values.
The modern approach often includes MELD-Na, which adds serum sodium to improve risk prediction. Sodium is important because low sodium levels (hyponatremia) often indicate advanced disease and worse outcomes.
Inputs required for MELD calculation
The calculator above uses four core inputs:
- Total bilirubin (mg/dL): reflects bile processing and liver function.
- INR: reflects blood clotting tendency and synthetic liver function.
- Creatinine (mg/dL): reflects kidney function, which strongly affects prognosis in liver disease.
- Sodium (mEq/L): used in MELD-Na for added prognostic accuracy.
If a patient is on recent frequent dialysis, creatinine is set to 4.0 mg/dL in standard scoring practice for MELD-based assessment.
How the formula works
1) Standard MELD
The traditional MELD equation is:
MELD = 3.78 × ln(bilirubin) + 11.2 × ln(INR) + 9.57 × ln(creatinine) + 6.43
For computation, very low values are adjusted upward to avoid invalid logarithms: bilirubin, INR, and creatinine are floored at 1.0. Creatinine is commonly capped at 4.0. The final score is bounded between 6 and 40.
2) MELD-Na adjustment
MELD-Na adds sodium using:
MELD-Na = MELD(i) + 1.32 × (137 − Na) − [0.033 × MELD(i) × (137 − Na)]
Sodium is constrained to 125–137 mEq/L in most implementations. This prevents extreme values from distorting the estimate.
How to interpret your score (quick guide)
Interpretation depends on the clinical context, but common mortality-risk groupings for MELD are:
- Below 10: generally lower short-term risk.
- 10–19: moderate risk, often requires close follow-up.
- 20–29: high risk with significantly increased short-term mortality.
- 30–39: very high risk.
- 40 or above: extremely high risk.
These ranges are useful for orientation, but treatment decisions involve far more than a single number.
Worked example
Suppose labs are: bilirubin 3.0 mg/dL, INR 2.0, creatinine 1.5 mg/dL, sodium 130 mEq/L, no dialysis. A typical calculator will produce a MELD in the mid-to-high teens and a MELD-Na slightly higher because sodium is below 137. That difference can meaningfully affect clinical urgency and transplant prioritization.
Important limitations
- MELD is a population-based risk estimate, not an individual destiny.
- Acute changes, infections, bleeding, and other complications can rapidly change prognosis.
- Lab timing matters: outdated values may misrepresent current status.
- Special populations (certain comorbid conditions) may need additional scoring context.
Frequently asked questions
Is MELD the same as MELD-Na?
No. MELD-Na is an extension of MELD that includes serum sodium and is often more predictive in advanced liver disease.
Can I use this for self-diagnosis?
It should be used only for education and discussion. Always rely on a licensed clinician for diagnosis, prognosis, and treatment planning.
Why does the calculator adjust low or extreme values?
These adjustments follow standard scoring conventions so the formula remains clinically meaningful and mathematically valid.
Final note
A fast meld calculo can be helpful for understanding disease severity trends, but interpretation should always be done in full clinical context. Use the score as one piece of the puzzle, not the whole picture.