Hi, I was due to have an operation to repair a damaged ankle ligament at the Lister in Stevenage tomorrow, but my operation has been cancelled due to my FT4 level. I have suffered from hypothyroidism for 7 years and currently take 125 micrograms of thyroxine per day which just about keeps me feeling human. My GP has been happy with my annual blood tests, my last one was about six months ago. Anyway the hospital tested me and my results came back as TSH 0.28 and FT4 17.4. The hospital say that although my TSH is OK, their "normal" range for FT4 is between 7.8 and 14.4 and I am therefore too risky to operate on!!! I'm 46, reasonably fit, don't smoke and drink a small amount. I have been told I need to go back to my GP, get them to "sort out" my levels and then get referred back, all of which could take months!! All the info I have read puts a normal FT4 at between 10 and 25, so I'm completely baffled. I have now got to take less thyroxine which will make me feel grotty, so I'm ok to be operated on (go figure). Has this happened to anyone else and what do you think of their normal range?