Effective renal plasma flow
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
Effective renal plasma flow (eRPF) is a measure used in renal physiology to calculate renal plasma flow (RPF) and hence estimate renal function.
- <math> eRPF = RPF \times extraction ratio</math> 
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.
- ↑ Sect. 7, Ch. 4: Measurement of Renal Plasma Flow; Renal Clearance of PAH
- ↑ Renal Mathematics Texas Tech University Health Sciences Center