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Could someone please help me with serum cortisol results?

I have recently had a morning blood test for serum cortisol which I don't understand. The reference Intervals on the test read At 0900h 200-700 nmol/L. My serum cortisol level was 255 nmol/ L. The doctor told me the optimum level was 500-700 and told me this could be the cause of my condition of feeling exhausted. I also have a thyroid condition. I was too shy to ask my doctor any questions. I appear to still be within the range though. Is my result a cause for a concern? How can I improve my cortisol level? My body seems to react really badly to stress and I try to avoid it. Many thanks to anyone that can help.
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Avatar universal
Usually, at least with a decent MD, one does more than one cortisol test to determine if one is really low and also does a stim test on the adrenals. An ACTH and antibodies test is done too to determine source of the issue as once you start taking replacements, the adrenals will atrophy. This is true whether they are OTC or by prescription. Adrenals are treated by replacing the function. This includes stress dosing.

I think you should not be shy when it comes to your health - it is yourself after all. So find out about the thyroid condition and ask as many questions as you want - it is  your body and your appointment.
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Avatar universal
Thank you for the information regarding tests. You're right, I shouldn't have been shy with my doctor. With thyroid issues, stomach problems etc. I was embarrassed to seem like an alarmist re another problem.Testing for antibodies makes a lot of sense because I have other autoimmune problems. I really appreciate your help.
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