I recently had a blood test with medi checks prior to booking an appointment with my GP. A week later I had a BT at my GP surgery. In both cases I fasted and had been without any medication for 24 hours. My private blood test result was TSH 4.5 (0.02 - 4.2), T4 14.5 (12 - 22), T3 3.7 (3.10 - 6.8). The GP result was TSH 2.9, T4 13.4 (same ranges). My GP ignored the private BT results saying 'levels go up and down' (!!!) and said I didn't need any increase on the 50mcg I am currently on. She doesn't want to re-test for 3 months and was less than encouraging about private blood tests. About 3 hours before I had the GP test I had a black sugarless coffee (just wasn't thinking). Could this have affected the TSH/T4 levels? I am thinking of just increasing my dose myself. Perhaps taking an additional 25mcg on alternate days and gradually increasing to 75mcg a day. I'm definitely feeling better but still suffering breathlessness and dry flaky skin as well as falling asleep inconveniently. Any advice gratefully received.