Do you know, I can't remember what is the accepted 'normal' range of cortisol. And I should know this!!! What I CAN say is that it is quite a large range, and it varies hugely throughout the day. It's usually highest 8-10am, and is about half that in the middle of the night. Your test will be 1st thing in the morning.
So the test you're having is a synacthen test. It could be long or short, the difference will be how long you sit there for after injection/how many blood tests you have after! They are testing to see, after being injected with synthetic Adrenocorticotropic Hormone (ATCH for short, hence name of test), does your adrenal gland react and make the right level of cortisone.
If your cortisone is low, it could mean a number of things. The 3 I can think of are:
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it's a bit low, but not very low so nothing to worry about, and your specialists will continue to find out what IS making you feel poorly. So it showed up low in the initial general blood test, (which is not accurate for cortisone) but looked normal in the detailed test.
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It is low as your adrenal gland does not make the right level of cortisone when the ATCH 'tells it to'. See Butturbur's comments about Addisons.
- The test shows it DOES react correctly to the ATCH, and further tests show that it is the ATCH that is low.
So, that was Cortisone 101 !!!
My issue is sort of different, which is I have had my adrenal glands removed, as they were a bit shonky. Hence I cannot make cortisone myself, so like Butturbur I take it daily, with extra when needed. Sort of in the same way that diabetics take insulin.
Nb the adrenal gland - where cortisone is made - is like a little hat that sits on top of each of the kidneys.
Remember, at this stage, this could be something or nothing. I think positively on medical tests, as I feel it is one stage closer to feeling better! You mentioned pain and gastric problems; they could both be caused by cortisone-y issues - but then again, they can be caused by lots of things, hence why you're having all these tests I guess! Poor gastro specialists, they have to rule things out before they find out what is wrong with you, don't they?!
Hope that helps, but please shout if you have any specific questions. And let us know how you get on.
Er, apols for looooong post.