What does a acth level mean?

A pituitary check. Acth is adrenocorticotrophic hormone. It is produced in the pituitary gland. It works to stimulate your adrenal glands to make cortisol each day. Acth production is related to your circadian rhythm (rises in the early morning) and other factors, like stress. Doctors may check the acth level to see how the pituitary gland is responding to abnormal levels of cortisol in the blood.