I find it crazy that my local fT4 range is 10-19.8, and fT3 is 3.5-5.5, yet about 20 miles away it could be 3.2-6.2 or 9.5-22.3.
We can't all differ that much around the UK, so why is there no UK-wide reference range? I'm still me whether I'm in Glasgow, Cardiff, Belfast or Cambridge!
What are your local reference ranges? It would be interesting to know the variance. And maybe we can use this information to our benefit.