How does dialysis affect phosphorus control, and what dietary modification accompanies dialysis?

• A. Dialysis Eliminates All Phosphate; No Diet Changes
• B. Dialysis Removes Phosphate; Requires Ongoing Phosphate Restriction and Phosphate Binders
• C. Dialysis Increases Phosphate; Requires Increased Phosphate Intake
• D. Dialysis Has No Effect on Phosphate; Diet Unchanged

Answer: (B)

In chronic kidney disease, the kidneys can’t excrete phosphorus effectively, so phosphate builds up in the blood. Dialysis helps by removing some of that phosphorus from the blood during treatment, but it doesn’t remove all of it and can’t compensate for the ongoing gut absorption between sessions. That’s why controlling phosphorus requires more than dialysis alone.

A low-phosphorus diet is needed to limit how much phosphorus enters the body, and phosphate binders are prescribed to trap dietary phosphate in the gut so it’s eliminated in the stool rather than absorbed into the bloodstream. Bindsters are typically taken with meals to be effective. This combination helps keep blood phosphorus levels closer to target and reduces risks associated with hyperphosphatemia, such as bone-mineral disorders and vascular calcification.