“…Perhaps I wonder, for some people, how they would understand this best. Would you just explain the methodology of testing thyroid function and why perhaps so many people fall through the cracks? In the 1940s, when the drug industry was really getting economically important after the Second World War, a new type of thyroid hormone was synthesized containing only T4. And around that same time, a blood test came on the market which measured iodine bound to protein. And they assumed that it was the same as the synthetic hormone,”