How is total weekly Kt/V calculated in PD?

• A. Product of peritoneal Kt/V and residual renal Kt/V.
• B. Difference between peritoneal Kt/V and residual renal Kt/V.
• C. It is equal to residual renal Kt/V alone.
• D. Sum of the peritoneal Kt/V from exchanges plus the residual renal Kt/V per week.

Answer: (D)

The key idea is that total weekly Kt/V for a PD patient comes from combining all sources of urea clearance over a week: the clearance provided by the peritoneal exchanges and the clearance from any remaining kidney function. These contributions are additive, so you sum the peritoneal Kt/V from all exchanges in the week with the residual renal Kt/V for the same period to get the total. It’s not a product or a difference, and it’s not just the kidney function alone.

This total helps judges adequacy and guides therapy toward target weekly Kt/V (often around 1.7 or higher, depending on guidelines and patient factors). For example, if the peritoneal component is 1.2 and the residual renal component is 0.5, the total weekly Kt/V would be 1.7.