Quantification of the suppression of adrenal gland function, typically following stimulation with adrenocorticotrophic hormone or a synthetic equivalent. Adrenal suppression may occur as a result of primary hypoadrenalism, or secondary to a number of other conditions including tuberculosis, or chronic exposure to corticosteroids. The trait is adrenal suppression measurement (EFO_0009176, an Experimental Factor Ontology entry).