Question: how to calculate ufr in dialysis?
Answer: If the same patient had 4 hours of dialysis: 5000 mL to remove ÷ 4 hrs ÷ 100 kg target weight ---> 12.5 mL/Kg/hr. Do a 5-hour dialysis and the ultrafiltration rate drops to 5000 ÷ 5 ÷100 = 10 mL/Kg/hr (and only just “safe”). Better would be 6 hours with an ultrafiltration rate of 8.3 mL/Kg/hr.