Circadian Rhythm & Testing

[Labradorfan]

I understand it’s best to test first thing in the am because circadian rhythms affect blood levels.

I have a chronic sleep problem which results in me having a very disrupted sleep /wake cycle.

This means it is totally reversed - so I literally go to sleep at 7am - 4pm.

(I am trying to rectify the underlying cause to this obvs & have diagnoses of depression, CFS/ME, RLS & PLMD).

Should I test what is 1st thing in the a.m which for me is at 4pm?

Maybe I should do an experiment & compare results.

[SeasideSusie Remembering]

Labradorfan

Here is a post which shows graphs of the daily rhythms of thyroid hormones:

healthunlocked.com/thyroidu...

If you think you have a thyroid problem and maybe looking for a diagnosis of hypothyroidism, then you need TSH to be highest. This is around midnight then falls throughout the day. We normally advise to test early morning, no later than 9am.

[Labradorfan]

Thanks SeasideSusie - apologies for delay replying. I think I may be confusing cortisol levels with thyroid hormones.

The article suggests TSH is highest around 12am & starts to fall from then. Sorry if this sounds stupid but how come people don’t self test then - or maybe they do?

Obvs health clinics aren’t able to offer that but at home...

I’m waiting for my tests to arrive so will have a go then - will post results in due course.