Aminohippuric acid PAH

- PAH is filtered and secreted by the renal tubules.

- Clearance of PAH is used to measure RPF.

- Clearance of PAH measures effective RPF and underestimates true RPF by 10%. (Clearance of PAH does not measure renal plasma flow to regions of the kidney that do not filter and secrete PAH.)

RPF = renal plasma flow (ml/min or ml/24 hr) Cpah = clearance of PAH (ml/min or ml/24 hr) [UIpah = urine concentration of PAH (mg/ml) V = urine flow rate (ml/min or ml/24 hr) [P]pah = plasma concentration of PAH (mg/ml)

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