High-molecular-weight insoluble polymers that contain functional cationic groups capable of undergoing exchange reactions with anions.

The presence of organisms, or any foreign material that makes a drug preparation impure.

Solutions prepared for exchange across a semipermeable membrane of solutes below a molecular size determined by the cutoff threshold of the membrane material.

Therapy for the insufficient cleansing of the BLOOD by the kidneys based on dialysis and including hemodialysis, PERITONEAL DIALYSIS, and HEMODIAFILTRATION.