I am curious as to why it is a 9AM test. The one I had measured cortisol throughout the day. Normally cortisol is high in the morning and falls throughout the day. What my test showed was that my cortisol rose during the day. A single 9AM test would not have shown this. No doubt your doctor has a s special purpose in mind, but I am still curious. Why don't you ask him when you see him?
I was wondering about this test my self I have had plenty of blood test and not sure if cortisol was one of them but do know that at no time during any of the blood test was I told I had to have an am test which I have read about when diagnoising adrenal issues. I was also wondering more about good testing for discovering adrenal problems. As I have read that it can be diagnoised late due to the kindney ect being able to cope right up till its about to fail. This concerns me a little since I've been struggleing to have quailty of life over the last year at least and recently (3 week ago) diagnoised with inappropriate sinus tachycardia. I'm currently on ivabradine for the tachycardia, which is helping but by no means is giving me an answer or making it easier on me.
I dont know if adreanal issues is whats causing my symptoms but I do know that I dont want to find out when it practicly too late anyway.
Time of test is critical for cortisol. Cortisol varies greatly by time of day and there are only a few times of day where there are ranges. Cortisol is the diurnal or circadian rhythm of the body - wakes you up in the morning and puts you to bed at night so you have to test accordingly, test for the peaks and ebbs. My docs insist on 12 hour fasting.
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