peak acid output

peak acid output (PAO)

on the pentagastrin test, after administration of pentagastrin, the sum of the two highest 15-minute outputs of gastric acid multiplied by 2, expressed as mmol/hr.

peak acid output

A measure of the maximum hydrogen ion (H+) production by gastric parietal cells, which is defined as the sum of the 2 highest consecutive 15-minute acid outputs after pentagastrin or histamine stimulation, multiplied by 2.