<prompt> What is the clearance of a substance when its concentration in the plasma is 10 mgdl, its concentration in the urine is 100 mgdl urine flow is 2 mlmin:2 mlmin10 mlmin20 mlmin200 mlmin  <response>: The Clearance of a Substance X is equal to the concentration of substance X in urine UX times the urine flow per unit of time V. divided by the arterial plasma level of X PX, or UXV.PX.This value is called the clearance of X CX. 