CRH and adrenal cortex adenoma: Using ACTH ratios pre‐CRH resulted in 47 TP, 1 TN, and 2 FN. Using ACTH ratios post‐CRH resulted in 49 TP and 1 TN. The patient with adrenal adenomas had pre‐CRH ACTH ratios <2.0 and post‐CRH ACTH ratios <3.0.