What is the net urea reabsorption rate?
The net urea reabsorption rate is equal to the ﬁltered load of urea (GFR  x plasma urea concentration ) - urinary excretion rate of urea (urine urea concentration  x  urine ﬂow rate ). ​
Therefore, net urea reabsorption = (50 mL/min x 2.5 mg/mL) – (50 mg/mL x 1 mL/min) = 75 mg/min.
0 mg/min
25 mg/min
50 mg/min
75 mg/min