p-aminohippurate clearance

p-a·mi·no·hip·pu·rate clear·ance

a good measure of renal plasma flow, which it slightly underestimates; when a low plasma concentration of p-aminohippurate (PAH) is maintained by intravenous infusion, the kidney extracts and excretes almost all of the PAH from the plasma before it reaches the renal vein.
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