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You are looking for acth in the upper third part of the range. Cortisol should be at least upper 20's at 8am. This is above the range, but the range is gotten from sick people. It's totally flawed toward the low end.
I can tell from am or pm if there is a problem if obvious enough. The best test to get is the acth stimulation test. This test is the last word on if you have adrenal insufficiency or not. You look for your cortisol value to double after the stim.
If primary AI, your stim won't double, it may go up some or not at all. If secondary, your stim can double, usually from a low number. If seen people report their stim started at 5 and went to 20 and the doc thought that meant the adrenals were superb. This is what happens to most secondaries, they double, triple or more from a low number. I saw one test that sextupled.
I was one that double from a low number and my endo kicked me out the door. Actually went from 10 to 19 (4pm) so didn't double. A few months later, a stim done by another doc at 10 am, started at 20 and went to 24. By then my adrenals had atrophied from lack of acth.
I have seen many people who were diagnosed secondary and then when they no longer were able to stim from the atrophy, the doc thought he made a mistake and diagnosis them as primary.
No matter what the doc says get mine and other opinions on those tests.
If AI then you need to stay away from caffeine.
You might want to get this book, easily gotten on EBAY.
Adrenal Fatigue The 21st century Stress Syndrome James L. Wilson
N.D.,D.C.,Ph.D. (I and others consider this book the bible for the adrenals. 350 pages. 16 pages on diet, 20 pages on Addison's. Everyone with an adrenal problem should have this book)
Chris.