Not new research (2002) but first time I've seen it and pretty powerful. I wish I'd known of this years ago.
m.jcem.endojournals.org/con...
It's worth ploughing through but here's my take on it...
May be useful for those who are struggling to get treated in either of these situations:
A) are "subclinical" (abnormal TSH but normal T4 & T3)
Or
B) have all results within range but you are unwell
It supports what many of us know to be the case - that "normal" thyroid levels vary between people: what is normal for one person may not be normal for another - and explains why using reference ranges is leaving many of us ill.
It shows that we each have our own individual "normal" thyroid levels, and that an individual's degree of fluctuation occurs within a much narrower range than the degree of variation BETWEEN people.
As a result, it shows that lab reference ranges that are established using a broad population of people CANNOT be relied upon to accurately determine whether an individual has thyroid disease.
It is the evidence that may have helped me get diagnosed many years earlier as I'd had several "normal" thyroid blood tests over several years whilst I was getting more and more ill. I eventually was diagnosed by comparing the change in my levels, by showing my GP that my TSH had been steadily climbing towards top of range and FT4 falling.