Para-amino hippurate, a molecule which is completely secreted into the tubules, so that blood leaving the kidney has no PAH in it. PAH is used to measure renal plasma flow (RPF).
See phenylalanine hydroxylase.
PAH (phenylalanine hydroxylase) is a human gene that provides instructions for making an enzyme called phenylalanine hydroxylase. Phenylalanine hydroxylase is responsible for the first step in processing the amino acid phenylalanine, which is a building block of proteins. Phenylalanine is obtained through the diet, including some artificial sweeteners.