Dialysis Water Quality: Life-Critical Purity Standards
Hemodialysis patients receive treatment 3 times per week, each session involving 120–200 liters of dialysate water in direct contact with their blood. Dialysis water must meet ultra-pure standards that far exceed drinking water requirements for microbiological quality. For PFAS, current dialysis water standards do not specifically address perfluorinated compounds, creating a gap in patient protection.
PFAS Exposure via Dialysis
Conventional reverse osmosis systems used in dialysis water preparation achieve 95–99% PFAS removal, substantially reducing but not eliminating PFAS exposure through dialysis. Patients receiving dialysis with water containing 10 ng/L PFOA receive approximately 1–2 µg of PFOA per dialysis session directly via the dialysate pathway—bypassing normal gastrointestinal absorption barriers.
Dialysis Patient Vulnerability
Dialysis patients have severely impaired kidney function—the primary organ for PFAS elimination. Reduced renal clearance means PFAS that enter dialysis patients accumulate to higher blood concentrations than in healthy individuals receiving the same exposure. The combination of direct blood exposure through dialysis and impaired elimination creates compounded PFAS body burden for this vulnerable population.
Standard Development Implications
Medical organizations including AAMI (Association for the Advancement of Medical Instrumentation) are reviewing dialysis water quality standards for PFAS parameters. Given the direct blood exposure route and patient vulnerability, dialysis water PFAS limits of 1 ng/L or lower—achieved only by RO with additional polishing—may be appropriate safety targets for this patient population