A normal ratio of Free T3 (FT3) to Free T4 (FT4) thyroid hormones appears to be a basic principle in thyroid hormone economy when no thyroid hormone dosing and no disease interfere. In this post, I provide graphs, quotations, and discussions from Gullo, Strich, and Anderson as I present their FT3:FT4 ratio results, and I … Continue reading Normal FT3:FT4 thyroid hormone ratios in large populations
Canadians can take pride in their historical defense of T3 testing in thyroid therapy. Our job defending the T3 test today is to remind people of what has changed since then in thyroid testing, and what is still the same. In 1981, Min Min Wong and Robert Volpé, MD published an article in the Canadian … Continue reading In 1981, Canadian physicians argued T3 was the best test in thyroid therapy
Recently I came across the information about the Free T3 lab test assay kit recall by Abbott Laboratories announced in late 2018. The recall was initiated in October 2018 and the FDA record was published in February 2019. The reason they list is the potential for a mistakenly lower Free T3 test result. "Samples tested … Continue reading The Abbott Free T3 test kit recall of 2018-2019
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 … Continue reading Abbott Laboratories’ reference range normalizes lower Free T3
