<prompt> In addisons disease, most diagnostic test is:Serum Na, K, renninSerum Na, K, saline suppressionSerum creatinineurea ratioACTH stimulation test  <response>: Answer is D ACTH stimulation test: The diagnosis of Adrenal insufficiency should be made only Hith A CTH stimulation testing - Harrisons ACTH stimulation test Cosvntropin stimulation test Synthetic ACTH Cosyntropin is given parentrally in a dose of 250 tg or 0.25 mg Serum is obtained for coisol between 30 to 60 minutes after Cosyntropin is administered Coisol levels should be greater than 495 mmolL 18pgdL Coisol levels 495 exclude the diagnosis of Addisons disease while coisol levels 495 suggest a possible diagnosis of Adrenal insufficiency primary or secondary. 