Hi Dawn, T4 doesnt normally jump about without a reason. 1) did you have a dose raise between tests, it takes 6-8 weeks for our bodies to fully assimilate a dose change and the numbers to settle so potentially your FT4 could raise but TSH be lagging behind. I would have expected a lower TSH with an above range FT4. 2) Did you follow the testing mantra, fasting test (can have water), earliest possible test, about 24 hours after last levo dose? If you take levo before the test it will give an artificially high FT4. Eating drinking or late test can cause lower TSH and GPs to try and drop dose on you. 3) do you take supplements? if so they must not be taken near levo as can affect absorption (especially iron or calcium) so a timing change between tests could show up as more or less levo absorbed. Also I believe if you supplement b vits you need to stop them a few days before if they contain biotin as again it can skew results.
Your FT3 and FT4 are similar to mine (on my bio) and it was suggested I was having conversion issues so I had B12, vit D, folate and ferritin tested. With the exception of ferritin they all needed work and getting them sorted has really improved fatigue and fogginess, just waiting to finish course before retesting. If you havent had yours checked and still fatigued etc may be worth it, need optimal levels of these vits to convert levo properly.
If your GP starts rumbling about lowering dose due to osteoporosis or cardiac risk, these are only risks if you are hyper and your FT3 says not.
Apols if you already know all of the above!!