How do you calculate weekly Kt/V for a PD patient?

How do you calculate weekly Kt/V for a PD patient?

• A. Sum the peritoneal urea clearance across all dwells over a week and add residual renal urea clearance; divide by total body water.
• B. Multiply daily urea clearance by seven and divide by body weight.
• C. Add peritoneal dialysis dose to residual renal function and divide by body surface area.
• D. Use only the peritoneal urea clearance without residual function.

Answer: (A)

Weekly Kt/V reflects how much urea is cleared over a week relative to the body’s urea distribution volume. In PD, you combine the total urea clearance from all dialysis dwells during the week with any residual renal urea clearance, then divide that weekly clearance by total body water. This sums both the dialysis dose and native kidney function, giving a single dimensionless measure of weekly solute removal. Using only peritoneal clearance or only body weight/BSA, or multiplying a daily value by seven without including residual function, fails to capture the true distribution volume or the contribution of remaining kidney function, which is why this approach is the correct one.

Weekly Kt/V reflects how much urea is cleared over a week relative to the body’s urea distribution volume. In PD, you combine the total urea clearance from all dialysis dwells during the week with any residual renal urea clearance, then divide that weekly clearance by total body water. This sums both the dialysis dose and native kidney function, giving a single dimensionless measure of weekly solute removal. Using only peritoneal clearance or only body weight/BSA, or multiplying a daily value by seven without including residual function, fails to capture the true distribution volume or the contribution of remaining kidney function, which is why this approach is the correct one.