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When is the best time of day to get cortisol test?

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Old 07-01-2003, 01:50 PM   #1
Join Date: Jun 2003
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ladysutton007 HB User
Question When is the best time of day to get cortisol test?

Well, I am finally getting a serum cortisol test after seeing first Endo today! My question is, what is the best time of day to be tested? Morning, afternoon or later in the day? I've read that cortisol levels change thru out the day! Please help! Thanks!

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Old 07-02-2003, 06:06 PM   #2
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orion HB Userorion HB Userorion HB Userorion HB Userorion HB User

8AM your cortisol levels will be highest, around midnight they will be lowest. Cortisol also goes up after you eat.

Old 07-02-2003, 06:19 PM   #3
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cathyk HB User

I had both the saliva and blood tests done and the levels were checked throughout the day.

Technically your levels "should" be highest in the morning, decreasing as the day goes on. However, mine were at their highest at 2 am, I would wake up out of a sound sleep and have lots of energy until 5 or 6 am then crash - the levels were at their lowest at this time. I wouldn't have known this if I hadn't done both tests.

Old 07-02-2003, 07:19 PM   #4
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ladysutton007 HB User

Thanks for the response! Anyway, so should I get my bloodwork (cortisol) test done in the morning? I plan on going at 8am. Also, from what I've read, what if the tests come back as "within normal" range? Do I give up or insist on more tests? Any help would be appreciated! Thanks so much, as I am a newbie to this site!

Old 07-10-2003, 12:08 AM   #5
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Coconut-Girl HB User

Hello Lady Sutton, The best time for you to have your test is in the am. Also don't forget you can't eat or drink anything past midnight the night before your test. Goodluck, Coco

Old 09-05-2003, 01:50 PM   #6
Join Date: Sep 2003
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lwe HB User

You might also want to get a cosyntropin (Corsotryn) stimulation test, to see if your adrenal glands can respond adequately to ACTH from your pituitary. This test found that I had a problem, when my baseline cortisol level had been fine.

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