A renal replacement apparatus (100), having a hemofilter (108); an extracorporeal blood circuit (102) configured to communicate blood from a patient (104), through the hemofilter, and back to the patient; and a flow measuring device (150) configured to measure at least one blood flow property as the blood is leaving the hemofilter and before the blood returns to the patient at a flow measuring device location (152), wherein the flow measuring device comprises at least one of a viscometer and a rheometer. Alternately, or in addition, the renal replacement apparatus may include thermomodulator system (222) including at least one thermomodulator configured to selectively heat and cool the blood in the extracorporeal blood circuit. The renal replacement apparatus (100) may have a controller (160). The controller may use artificial intelligence. Other embodiments are described herein.
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