GFR Calculator DaVita

CKD-EPI Creatinine 2021 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 GFR Calculator DaVita?

The GFR Calculator DaVita uses the CKD-EPI Creatinine 2021 equation without race factor to estimate glomerular filtration rate (GFR) from serum creatinine, age, and sex. This updated equation provides improved accuracy in assessing kidney function.

2. How Does The Calculator Work?

The calculator uses the CKD-EPI 2021 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 uses updated coefficients and does not include race factor, providing a more equitable assessment of kidney function across all populations.

3. Importance Of eGFR Calculation

Details: Accurate GFR estimation is essential for diagnosing chronic kidney disease, monitoring disease progression, and determining appropriate treatment strategies and medication dosages.

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 years).

5. Frequently Asked Questions (FAQ)

Q1: Why Does This Calculator Not Include Race Factor?
A: The CKD-EPI 2021 equation removes race factor to provide more equitable kidney function assessment across all ethnic groups.

Q2: What Are Normal eGFR Values?
A: Normal eGFR is generally ≥90 mL/min/1.73m². Values below 60 mL/min/1.73m² for 3+ months indicate chronic kidney disease.

Q3: When Should Creatinine Be Measured?
A: Morning fasting samples are preferred, but random samples are acceptable. Avoid testing after protein-rich meals or strenuous exercise.

Q4: What Are The Limitations Of This Equation?
A: Less accurate in extremes of age and body size, amputees, pregnant women, and individuals with rapidly changing kidney function.

Q5: Can This Calculator Be Used For Drug Dosing?
A: For precise medication dosing, especially with narrow therapeutic windows, measured GFR may be necessary in specific patient populations.