Total cell volume (TCV) is an indirect measure of the dialyzer performance.

• A. Dialyzer efficiency
• B. Dialyzer performance
• C. Blood glucose control
• D. Ultrafiltration rate

Answer: (B)

Total cell volume reflects how the blood’s cellular components behave as they pass through the dialysis circuit, and it changes in response to how well the dialyzer is removing wastes and maintaining proper blood flow and composition. Because TCV doesn’t measure a single parameter like a specific solute clearance or a fluid removal rate, it serves as an indirect gauge of how smoothly the dialyzer is functioning overall. A well-performing dialyzer maintains stable cell volume and blood properties, while a dialyzer with reduced performance (for example due to membrane fouling or inadequate flow) can lead to changes in TCV that signal suboptimal operation. That’s why this statement points to dialyzer performance as the best descriptor.