We’ve known since at least 2002 that being within “normal range” is never good enough when it comes to thyroid hormone blood tests. An important set of four articles has taught us that each human being has an optimal range for TSH, Total T4 and Total T3 that is far less the width of the population-wide reference range. Andersen, S., Pedersen, K. M., Bruun, N. H., & Laurberg, P. (2002). Narrow Individual Variations in Serum T4 and T3 in Normal Subjects: A Clue to the Understanding of Subclinical Thyroid Disease. The Journal of Clinical Endocrinology & Metabolism, 87(3) Andersen, S., …