Adrenocorticotropic hormone, corticotropin.

ACTH is a hormone released from the anterior pituitary gland in the brain, also known as: Serum adrenocorticotropic hormone; Adrenocorticotropic hormone. The levels of ACTH change with the body’s natural 24-hour cycle of processes (circadian rhythms). An ACTH test is performed early in the morning for the most accurate results.