Davita Dialysis GFR Calculator

DaVita GFR Equation:

\[ eGFR = 142 \times \min(Scr/\kappa, 1)^\alpha \times \max(Scr/\kappa, 1)^{-1.200} \times 0.9938^{age} \times (1.012 \text{ if female}) \]

Estimated GFR (eGFR):

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1. What is the DaVita GFR Equation?

The DaVita GFR equation is specifically designed for estimating glomerular filtration rate (GFR) in dialysis patients. It provides an accurate assessment of residual kidney function using serum creatinine, age, and gender parameters.

2. How Does the Calculator Work?

The calculator uses the DaVita GFR equation:

\[ eGFR = 142 \times \min(Scr/\kappa, 1)^\alpha \times \max(Scr/\kappa, 1)^{-1.200} \times 0.9938^{age} \times (1.012 \text{ if female}) \]

Where:

\( Scr \) — Serum creatinine (mg/dL)
\( \kappa \) — 0.7 (female) or 0.9 (male)
\( \alpha \) — -0.241 (female) or -0.302 (male)
\( age \) — Age in years
1.012 — Female multiplier

Explanation: This equation is optimized for dialysis populations and accounts for the unique creatinine metabolism patterns in patients with end-stage renal disease.

3. Importance of GFR Calculation for Dialysis

Details: Accurate GFR estimation in dialysis patients is crucial for determining residual renal function, guiding dialysis adequacy, and adjusting medication dosages in patients with some remaining kidney function.

4. Using the Calculator

Tips: Enter serum creatinine in mg/dL, age in years, and select gender. All values must be valid (creatinine > 0, age between 1-120). Use pre-dialysis creatinine values for most accurate results.

5. Frequently Asked Questions (FAQ)

Q1: Why use DaVita GFR instead of standard equations?
A: The DaVita equation is specifically validated for dialysis populations and provides more accurate estimates of residual renal function in ESRD patients.

Q2: How does residual GFR affect dialysis treatment?
A: Residual GFR contributes to overall solute clearance and may influence dialysis prescription, fluid removal goals, and medication adjustments.

Q3: When should creatinine be measured in dialysis patients?
A: Preferably pre-dialysis, at the same time relative to dialysis treatments for consistency. Avoid measurements immediately after dialysis sessions.

Q4: Are there limitations to this equation in dialysis patients?
A: Accuracy may be affected by muscle mass changes, nutritional status, and inter-dialytic periods. Regular monitoring provides better trends than single measurements.

Q5: How often should GFR be calculated in dialysis patients?
A: Monthly calculation is recommended as part of routine dialysis adequacy assessment, along with other markers of residual renal function.