Renal Kidney Failure Index Calculator

What is the Renal Failure Index (RFI)?

The Renal Failure Index (RFI) is a measure used to assess kidney function and the likelihood of kidney failure. It takes into account several key indicators of kidney health, including blood urea nitrogen (BUN), serum creatinine, and glomerular filtration rate (GFR).

The Formula for RFI Calculation

The Renal Failure Index is calculated using the following formula:

\[RFI = \frac{BUN \times Creatinine}{GFR}\]

Where:

• BUN = Blood Urea Nitrogen (mg/dL)
• Creatinine = Serum Creatinine (mg/dL)
• GFR = Glomerular Filtration Rate (mL/min/1.73m²)

Step-by-Step RFI Calculation

1. Obtain laboratory values for BUN, Creatinine, and GFR
2. Multiply BUN by Creatinine
3. Divide the result by GFR
4. The resulting value is the Renal Failure Index

Example Calculation

Let's calculate the RFI for a patient with the following values:

• BUN = 30 mg/dL
• Creatinine = 1.5 mg/dL
• GFR = 60 mL/min/1.73m²

Applying the formula:

\[RFI = \frac{30 \times 1.5}{60} = 0.75\]

Visual Representation

The blue portion of the bar represents the calculated RFI (0.75) relative to a scale of 0 to 4.

Interpreting RFI Results

• RFI < 1: Normal kidney function
• 1 ≤ RFI < 2: Mild kidney dysfunction
• 2 ≤ RFI < 3: Moderate kidney dysfunction
• RFI ≥ 3: Severe kidney dysfunction or failure

It's important to note that the RFI should be interpreted in conjunction with other clinical findings and under the guidance of a healthcare professional.