GFR Davita 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 estimates glomerular filtration rate (GFR) from serum creatinine, age, and sex. It provides an accurate assessment of kidney function using a modified version of established GFR estimation formulas.

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: The equation accounts for the non-linear relationship between creatinine and GFR, with different coefficients for different demographic groups.

3. Importance of eGFR Calculation

Details: Accurate GFR estimation is crucial for diagnosing chronic kidney disease, determining disease stage, monitoring kidney function over time, and guiding appropriate medication dosing for patients with renal impairment.

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). For most accurate results, use fasting morning blood samples.

5. Frequently Asked Questions (FAQ)

Q1: What makes the DaVita equation different from other GFR equations?
A: The DaVita equation uses specific coefficients (142, -1.200, 0.9938) that have been optimized for clinical use in dialysis and kidney care settings.

Q2: What are normal eGFR values according to DaVita?
A: Normal GFR is generally ≥90 mL/min/1.73m². Values between 60-89 may indicate early kidney disease, while values below 60 for 3+ months indicate chronic kidney disease.

Q3: When is the best time to measure creatinine for this calculation?
A: Morning fasting samples are ideal to avoid dietary influences. Avoid testing immediately after high-protein meals or intense physical activity.

Q4: Are there patient populations where this equation may be less accurate?
A: This equation may be less accurate in extremes of age, amputees, pregnant women, patients with severe malnutrition or obesity, and those with rapidly changing kidney function.

Q5: Can this calculator be used for medication dosing adjustments?
A: While useful for screening and monitoring, for precise drug dosing in critical situations, measured GFR or more comprehensive renal function assessment may be required.