I have just found out my serum ATCH is low. Level was 6 (range 0-45) lab report it's low. The Synacthen test done at the same time was ok. My adrenals can respond to ATCH, great! However the reason my cortisol level was 370 is due to the fact my ATCH is so low. I have terrible fatigue and muscles in my thighs feel so weak, climbing stairs is like doing a session at the gym! I have been on sick leave since November as I was so bad, including awful hypoglycemia and exhaustion. GP put me on HC and I felt better (ish) but told me to come off for Synacthen test. I have not yet heard back from the consultant who ordered these tests. The hospital ward where I had the Synacthen test done rang me on the day to say adrenals were fine but were waiting for the ATCH blood test. They said if all was fine theyd just send a letter and I'd be discharged. I'm worried about my low ATCH level as it sounds like I could have secondary AI which means I should be on steroids. Anybody have low ATCH SERUM levels.