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It is the removal of solvents containing solutes across a semipermeable membrane within the filter/dialyser during haemodialysis that is achieved through the programmed pressure (Transmembrane Pressure or TMP)which is artifically exerted by a combination of two forces 1) the positive hydrostatic pressure (or pump speed) and the negative dialysate pressure brought about by a pump within the circuit. The net movement and removal of fluid/solvents is Ultrafiltration.

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Q: What is ultrafiltration for renal dialysis?
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