In Kinetic PET, which times are used for daytime dwells?

• A. 0 hr, 2 hr, 4 hr
• B. 1 hr, 3 hr, 5 hr
• C. 2 hr, 4 hr, 6 hr
• D. 0 hr, 1 hr, 2 hr

Answer: (A)

Daytime dwells in Kinetic PET are the three sampling points used to chart how solutes move between plasma and dialysate during the main daytime period. The protocol uses 0 hour, 2 hour, and 4 hour dwells. The 0 hour time point is recorded right after the dialysate is instilled and provides the initial concentrations. The 2 hour dwell captures the early transport phase, and the 4 hour dwell captures the later phase, giving enough data to model transport rates and categorize peritoneal membrane transport characteristics. This combination is chosen to balance practical workflow with informative kinetics, allowing reliable assessment without longer daytime dwell times.