Thyroid hormone levels naturally fluctuate throughout the day due to circadian rhythms, so thyroid tests should be performed first thing in the morning, ideally between 7:00 to 9:00 a.m., to ensure consistent and accurate results; testing at different times of day can cause apparent variations in thyroid levels that may not indicate actual thyroid dysfunction.
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T3 going up and down?Added:
If your thyroid levels are going up and down from one test to the next, the simplest reason can be the time of day you're measuring. My name is Dr. Christianson. I'm an endocrinologist with 30 years of natural thyroid experience. Thyroid hormones are circadian. What that means is they are supposed to fluctuate throughout the day. All the guidelines suggest testing first thing in the morning, ideally between 7:00 to 9:00 a.m. If you're not always testing then, your scores may not line up and that may be all there is to it.
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