In this post, I’ll comment on the case study of a woman who suffered for 23 years with undiagnosed central hypothyroidism between 1992 and 2015 (age 34 to age 57) because her TSH was repeatedly in normal range. She developed impaired kidney function, muscle damage, and pericardial effusion. Who saved the day? A biochemist working at the laboratory. The authors of the 2017 article — Glyn, Harris, and Allen — reported that: “the clinical biochemist reviewed the patient’s results and elected to add on an fT4 to her thyroid function tests.” Upon finally testing both Free T3 (FT3) and Free …