Dialysis Machine Temperature: Maintained at Body Temperature for Safety

Hemodialysis machines warm dialysate to 37°C (98.6°F)—core body temperature—to prevent:

• Thermal shock to blood cells and vascular endothelium.
• Hypothermia during prolonged extracorporeal circulation (blood cools rapidly outside body).
• Vasoconstriction/hypotension from cold fluid return.
• Patient discomfort and shivering (↑ O₂ demand).

Modern machines continuously monitor and adjust dialysate temperature (±0.5°C). Some protocols use slight cooling (35–36°C) for intradialytic hypotension, but standard is normothermia.