calculo meld

What is “cálculo MELD”?

“Cálculo MELD” refers to calculating the Model for End-Stage Liver Disease (MELD) score, a clinical scoring system used to estimate severity of chronic liver disease and short-term mortality risk. It is widely used in liver transplant evaluation and prioritization.

In modern practice, many centers also use MELD-Na, which includes serum sodium because sodium abnormalities can worsen prognosis in advanced cirrhosis.

Inputs used in the MELD score

• Bilirubin: reflects the liver’s ability to process bile pigments.
• INR: reflects blood clotting function and synthetic liver performance.
• Creatinine: reflects kidney function, a key prognostic factor in liver failure.
• Sodium (for MELD-Na): improves risk prediction in many patients with cirrhosis.

Standard MELD equation

MELD (original) is often represented as:

MELD = 3.78 × ln(bilirubin) + 11.2 × ln(INR) + 9.57 × ln(creatinine) + 6.43

Clinical implementations typically apply lower and upper bounds to some values (for example, floor of 1.0 for select labs, creatinine cap, and score limits).

MELD-Na equation

The MELD-Na adjustment commonly used in allocation systems is:

MELD-Na = MELD + 1.32 × (137 − Na) − 0.033 × MELD × (137 − Na)

Sodium is generally bounded in the formula (commonly 125 to 137 mEq/L) to reduce distortions from extreme values.

How to interpret the result

Higher MELD or MELD-Na values indicate higher short-term mortality risk and generally greater urgency for specialized hepatology/transplant assessment. A quick educational interpretation often follows these broad ranges:

• <10: lower short-term risk (relative).
• 10–19: moderate risk; close follow-up is important.
• 20–29: high risk; urgent specialty management is often needed.
• 30–39: very high risk.
• 40+: critically high risk profile.

Exact decisions always depend on the full clinical picture, complications (ascites, encephalopathy, infections, bleeding), comorbidities, and transplant-center criteria.

Example (manual understanding)

Suppose a patient has bilirubin 3.0, INR 2.0, creatinine 1.5, and sodium 130. You would:

• Apply minimum/maximum bounds per clinical formula rules.
• Compute MELD from bilirubin, INR, and creatinine using natural logs.
• Apply sodium correction to obtain MELD-Na.
• Round and clamp score according to implementation standards.

The calculator above performs those steps instantly and explains the estimated risk tier.

Important limitations

• MELD is a population-based risk tool, not a complete diagnosis.
• Single lab snapshots can be misleading if the patient is unstable.
• Lab quality, timing, and recent interventions can change values significantly.
• Different systems may use updated formulas (for example, MELD 3.0 in some settings).

Final note

Use MELD calculators to support discussion, not replace expert care. If this is for a real patient, review results directly with a hepatologist or transplant team and use your institution’s official scoring policy.