Diffusive removal of uremic toxins via semipermeable membrane

Diffusive removal of uremic toxins via semipermeable membrane describes the principal mechanism of toxin clearance in hemodialysis (and to a lesser extent peritoneal dialysis), whereby small toxic solutes migrate from blood into dialysate across a membrane driven by concentration gradients[2][3]. This process is essential for patients with kidney failure and operates by passive diffusion; effectiveness depends on pore size, flow rates, and membrane composition. While it efficiently removes small molecules, protein-bound toxins are less removed; larger pore or adsorption-enhanced membranes can improve clearance but may risk removal of useful plasma components (e.g., albumin)[1][2]. The phrase does not specify a biological molecule or receptor, but a physical method central to renal replacement therapy.

Other names

diffusion-mediated toxin removalhemodialysis diffusiondialytic clearance by diffusionremoval of uremic toxins by dialysis

Diffusion across semipermeable membrane; Convection (sometimes, if combined); Adsorption (sometimes, if combined)