Effective renal plasma flow

Overview
Effective renal plasma flow (eRPF) is a measure used in renal physiology to calculate renal plasma flow (RPF) and hence estimate renal function.


 * $$ eRPF = RPF \times extraction ratio$$

Where extraction ratio is the amount of compound entering the kidney that got excreted into the final urine.

When using a compound with an extraction ratio near 1, such as para-aminohippurate (PAH), then eRPF is almost equal to RPF. Therefore, PAH clearance is a method to estimate renal plasma flow.