I just received a letter got to go for a Synacthen Test. I read the previous thread and understand it measures cortisol but just wondering, the appointment letter states do not take any "medication" on the day of the test. Does this include insulin? As far as I am aware blood is taken after 30 mins and 1 hours and then I can take my "medication". Will I have to skip breakfast as well if I don't take my insulin? Also I read something about insulin intolerance, can you shed any light on this please. Many thanks