Turn the BFR to and the DFR to which values?

• A. BFR 300-400 and DFR 500
• B. BFR 100-200 and DFR 300
• C. BFR 50-100 and DFR 100
• D. BFR 600-700 and DFR 600

Answer: (A)

The setting that provides safe, effective dialysis starts with choosing blood and dialysate flow rates that balance adequate toxin removal with protecting the access and the patient. A blood flow rate in the 300–400 mL/min range allows a steady volume of blood to be processed without overstraining the vascular access or causing undue pressure changes. It keeps clearance reasonable and helps minimize access-related complications.

Dialysate flow rate around 500 mL/min supports good diffusion of solutes out of the blood while maintaining stable machine operation and temperature control. This rate is high enough to achieve effective clearance but not so high as to waste dialysate or stress the system.

Lowering either value significantly—such as a blood flow rate in the 100–200 mL/min range or a dialysate flow rate around 300 mL/min—would reduce clearance and waste the treatment, leading to inadequate dialysis. Pushing the flow rates too high, like a blood flow rate of 600–700 mL/min or a dialysate flow rate of 600 mL/min, can exceed what the access and machine can safely handle and increase the risk of complications.

So, the best combination that achieves effective clearance while maintaining safety is a blood flow rate of about 300–400 mL/min with a dialysate flow rate of about 500 mL/min.