Serum Bilirubin (mg/dL) Enter total bilirubin level in mg/dL (e.g., 3.0)

INR (ratio) Enter international normalized ratio (e.g., 1.80)

Serum Creatinine (mg/dL) Enter serum creatinine level in mg/dL (e.g., 1.2)

Dialysis Status (within last 7 days, 2 or more sessions)

Check if the patient had 2 or more dialysis sessions in the past 7 days

Quick Examples:

Moderate liver disease Severe liver disease with renal impairment

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This calculator is a screening tool only, not a diagnostic instrument. It is not intended to replace professional medical evaluation. Consult a healthcare provider.

This tool is designed for use by healthcare professionals and patients under medical supervision. Enter values from recent lab results for the most useful estimate.

What Is Model for End-Stage Liver Disease (MELD) Score

The MELD score is a number that doctors use to estimate how sick a person with liver disease may be. It looks at three lab values to guess the chance of dying within the next three months. A higher score means the liver may be working less well. The score is often used to help decide who needs a liver transplant sooner. It does not measure liver function directly but gives a general idea of disease severity based on blood test results.

How Model for End-Stage Liver Disease (MELD) Score Is Calculated

Formula

The formula takes each lab value and applies a natural logarithm to it. A logarithm helps make very large or very small numbers easier to work with. Each value is then multiplied by a weight that shows how much it matters. Bilirubin and INR get smaller weights, while creatinine gets a larger weight. This means changes in kidney function may shift the score more than changes in bilirubin. A constant of 6.43 is added at the end. Before calculating, any value below 1.0 is set to 1.0 so the logarithm does not produce a negative number. If a patient is on dialysis, creatinine is automatically set to 4.0 mg/dL.

Why Model for End-Stage Liver Disease (MELD) Score Matters

Knowing the MELD score helps doctors and patients understand how severe liver disease may be at a given point in time. A higher score is generally associated with a greater need for close medical attention or transplant evaluation.

Why Liver Disease Severity Scoring Is Important for Treatment Planning

When liver disease gets worse, lab values change in ways that the MELD score can pick up. Without a scoring system, it may be hard to tell how quickly things are changing. A rising MELD score may signal that the liver is failing faster, which could mean treatment plans need to change. Ignoring score changes may lead to delays in referral for transplant or other advanced care.

For Liver Transplant Prioritization

In the United States, the MELD score is commonly used to rank patients on the liver transplant waiting list. A higher score generally means a patient may be prioritized for a donor liver sooner. This system aims to give livers to those who may need them most based on lab data rather than how long they have been waiting.

For Clinicians Using MELD-Na

The standard MELD formula does not include sodium levels. A newer version called MELD-Na adds serum sodium to the score. Some studies suggest MELD-Na may provide a slightly more accurate estimate for certain patients. Clinicians may consider using MELD-Na when sodium is very low, as this may add useful information about disease severity.

MELD Score vs Child-Pugh Classification

The Child-Pugh classification is another way to stage liver disease. It uses bilirubin, albumin, INR, and the presence of fluid in the belly or brain confusion. Child-Pugh gives a letter grade from A to C. The MELD score uses only lab numbers and no subjective findings. Many doctors prefer MELD because it is based only on objective lab values, while Child-Pugh may vary depending on who is grading the symptoms.

Example Calculation

Consider a patient with moderate liver disease. Their lab results show a serum bilirubin of 3.0 mg/dL, an INR of 1.8, a serum creatinine of 1.2 mg/dL, and they are not on dialysis.

First, all three values are above 1.0, so no adjustment is needed. The natural logarithm of each value is taken: ln(3.0) is about 1.10, ln(1.8) is about 0.59, and ln(1.2) is about 0.18. These are multiplied by their weights: 3.78 times 1.10, 11.2 times 0.59, and 9.57 times 0.18. Adding those together with 6.43 gives about 18.9, which rounds to 19.

MELD Score: 19 -- Risk Category: Moderate statistical risk

A score of 19 falls in the moderate statistical risk range. This result may suggest the patient could benefit from discussions with their doctor about transplant evaluation or closer monitoring of lab values over time. It does not by itself confirm any diagnosis but provides an estimate that may guide next steps.

Frequently Asked Questions

How often should a MELD score be checked?

For patients on a liver transplant waiting list, the MELD score is typically rechecked every time new lab results are available, which may be weekly or monthly. For patients not on a list, a doctor may order the labs periodically to track changes in liver and kidney function over time.

What is the highest MELD score possible?

There is no strict upper limit to the MELD score because the formula uses logarithms. In practice, scores above 40 are very uncommon and are generally associated with a very high statistical risk. Most transplant centers may consider scores above 35 to be extremely urgent.

Does the MELD score work for children?

The standard MELD score was developed using data from adults. For children under 12 years old, a different version called PELD (Pediatric End-Stage Liver Disease) is typically used. PELD includes age, albumin, growth failure, and bilirubin, but not creatinine or INR in the same way.

Can I use this calculator if I have acute liver failure?

The MELD score was designed for chronic liver disease, not sudden liver failure. In acute liver failure, other factors such as the cause of the injury and how quickly symptoms started may be more important. A healthcare provider may use different tools for acute cases. This calculator uses standard population formulas that may not account for individual conditions.