DaVita Dialysis GFR Calculator

DaVita Dialysis GFR Equation:

\[ GFR = \frac{(U_{cr} \times V)}{P_{cr} \times T} \times \frac{1.73}{BSA} \]

Urine Creatinine (U_cr):

mg/dL

Urine Volume (V):

Plasma Creatinine (P_cr):

mg/dL

Collection Time (T):

minutes

Body Surface Area (BSA):

m²

Estimated GFR:

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1. What is DaVita Dialysis GFR?

The DaVita Dialysis GFR equation calculates glomerular filtration rate (GFR) for dialysis patients using urine and plasma creatinine measurements along with urine collection volume and time. This method provides an accurate assessment of residual kidney function in patients undergoing dialysis.

2. How Does the Calculator Work?

The calculator uses the DaVita dialysis GFR equation:

\[ GFR = \frac{(U_{cr} \times V)}{P_{cr} \times T} \times \frac{1.73}{BSA} \]

Where:

\( U_{cr} \) — Urine creatinine concentration (mg/dL)
\( V \) — Urine volume (mL)
\( P_{cr} \) — Plasma creatinine concentration (mg/dL)
\( T \) — Collection time (minutes)
\( BSA \) — Body surface area (m²)
1.73 — Standard adult BSA value

Explanation: The equation measures the clearance rate of creatinine from the blood, normalized to standard body surface area.

3. Importance of GFR Calculation for Dialysis

Details: Accurate GFR measurement is crucial for dialysis patients to assess residual kidney function, adjust dialysis prescriptions, and guide clinical decisions about treatment adequacy.

4. Using the Calculator

Tips: Enter all required values from a timed urine collection. Values must be positive numbers. Standard BSA is 1.73 m² but can be adjusted for individual patients.

5. Frequently Asked Questions (FAQ)

Q1: Why measure GFR in dialysis patients?
A: Residual kidney function contributes significantly to overall clearance, especially in patients starting dialysis. It helps personalize treatment.

Q2: How often should GFR be measured in dialysis patients?
A: Typically every 1-3 months, or when there's a significant change in clinical status.

Q3: What's a typical GFR range for dialysis patients?
A: Most have GFR <15 mL/min/1.73m², but values vary. Even small amounts of residual function are clinically important.

Q4: Are there limitations to this method?
A: Requires accurate timed urine collection. May be less reliable with very low urine output or unstable creatinine production.

Q5: How does this differ from standard GFR calculations?
A: This method measures actual clearance rather than estimating from serum creatinine alone, which is more accurate for dialysis patients.