Meld Calculator 3.0

The MELD (Model for End-Stage Liver Disease) score is a widely used clinical tool to assess liver function and determine the urgency of liver transplant. The MELD 3.0 version improves upon the original MELD by incorporating more recent data and better reflecting current clinical practices.

What is MELD?

The MELD score is a standardized method for evaluating liver function in patients with chronic liver disease. It combines three key laboratory values:

Creatinine: A measure of kidney function
Bilirubin: A measure of liver function
INR (International Normalized Ratio): A measure of blood clotting

The score ranges from 6 to 40, with higher scores indicating more severe liver dysfunction and greater urgency for transplant evaluation. The MELD score is used by transplant centers to prioritize patients on the waiting list.

Important Note

The MELD score is not a diagnostic tool for liver disease. It should be used in conjunction with clinical examination and other diagnostic tests to assess liver function.

How to Use the MELD Calculator

To calculate the MELD score, you'll need three key laboratory values:

Creatinine level (mg/dL)
Total bilirubin level (mg/dL)
INR (International Normalized Ratio)

Enter these values into the calculator on the right side of this page. The calculator will compute the MELD score and provide an interpretation of the result.

MELD Formula

The MELD 3.0 score is calculated using the following formula:

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

Where:

creatinine = serum creatinine level (mg/dL)
bilirubin = total bilirubin level (mg/dL)
INR = International Normalized Ratio

Interpreting MELD Scores

The MELD score ranges from 6 to 40, with higher scores indicating more severe liver dysfunction. The interpretation of MELD scores is as follows:

MELD Score	Interpretation
6-11	Mild liver dysfunction
12-19	Moderate liver dysfunction
20-29	Severe liver dysfunction
30-39	End-stage liver disease

Patients with MELD scores of 20 or higher are typically considered for liver transplant evaluation. The MELD score is also used to prioritize patients on the transplant waiting list.

Worked Example

Let's calculate the MELD score for a patient with the following laboratory values:

Creatinine: 1.2 mg/dL
Bilirubin: 2.5 mg/dL
INR: 1.4

Calculation Steps

1. Calculate the natural logarithm of each value:

ln(1.2) ≈ 0.1823
ln(2.5) ≈ 0.9163
ln(1.4) ≈ 0.3365

2. Multiply each logarithm by its respective coefficient:

9.57 × 0.1823 ≈ 1.7424
3.78 × 0.9163 ≈ 3.4726
11.2 × 0.3365 ≈ 3.7437

3. Sum the products and add the constant:

1.7424 + 3.4726 + 3.7437 + 6.43 ≈ 15.3887

4. Round to the nearest whole number: 15

The calculated MELD score is 15, which falls in the "Moderate liver dysfunction" range according to the interpretation table.

FAQ

What is the difference between MELD and MELD-Na?

The MELD-Na score is an updated version of the MELD score that incorporates sodium levels as an additional factor. MELD-Na is used in some transplant centers to better reflect the impact of sodium levels on liver function and transplant outcomes.

How often should MELD scores be calculated?

MELD scores should be calculated whenever there are significant changes in the patient's laboratory values or clinical condition. Typically, this occurs every 1-2 weeks during hospitalization and more frequently if the patient's condition is deteriorating.

Can MELD scores be used to predict transplant outcomes?

While MELD scores are strongly associated with transplant outcomes, they should not be used as the sole predictor. Other factors such as patient age, comorbidities, and the quality of the donor liver also play important roles in determining transplant success.