I have had 3 cortisol tests over a 7 month period. All tests were done at the same time of day. Ref range is 6.2 - 19.4 In July, I was at a 6.5 and in October I was 19.3. In February I was at 27.2. I am having another test done tomorrow...this one will check midnight and am cortisol. I have no idea what this rising cortisol means or could mean. Other markers for adrenal problems are normal (I can't remember what those are but my dr said the indicators for Cushing's and Addison's are not there). I am on thyroid blocking drugs for hyperthyroid...I don't know if that cld b a cause. Anyone have any knowledge of this?