Free T3 test
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Abbott Laboratories’ reference range normalizes lower Free T3
In late 2018, in Ontario, Life Labs changed its reference range for Free T3 (Triiodothyronine) thyroid lab tests. In our closed Canadian Thyroid Support Group where patients share their lab results and therapy progress over time, this particular Free T3 test has been behaving strangely so far, especially comparing changes from the old assay to the…
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Why the Free T3 test matters so much
It is surprising that Free T3 is considered an unnecessary test since it is the most active, most essential thyroid hormone in the human body. The research I outline in this post shows that Lower Free T3 levels in blood correlate with very poor health status both within and beyond “low T3 syndrome” — low…
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MEMES: Against Table 2 in the “Choosing Wisely Canada” T3 & T4 toolkit
The “Choosing Wisely Canada” toolkit promoting limitation of Free T3 and Free T4 testing has been the food for some meme refutations. Choosing Wisely Canada. (n.d.). Toolkit: Less is More with T3 & T4. Retrieved December 30, 2018, from https://choosingwiselycanada.org/perspective/toolkit-t4-t3/ Recently, we’ve focused on their Table 2 which outlines situations they recommend NOT to order…
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Our response to Choosing Wisely’s harmful Table 2
Choosing Wisely Canada, together with the Canadian Society for Endocrinology and Metabolism, have collaborated on a harmful toolkit to reduce Free T3 and Free T4 hormone testing in order to save money. As you can see in their Table 2 from page 9 of their toolkit, they want to prevent T3 and T4 testing in…
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Thyroid hormone economics 101: Less FT3 per unit of TSH
Despite a normal TSH, some thyroid patients will fall far below their healthy set point for Free T3, the active thyroid hormone. TSH behaves differently in thyroid patients. TSH cannot indicate T3 sufficiency in thyroid therapy. Source of graph: Hoermann, R., Midgley, J. E. M., Larisch, R., & Dietrich, J. W. (2016). Relational Stability in…