I'm a little confused about my TSH/FT4 results. My thyroid was removed in 2007, I have been on Synthroid 200 mcg since then. Jan, 2009 results - TSH = 1.63/no FT4; Jan. 2010 - TSH = 29.25/FT4 = 1.35; Feb. 2010 - TSH = .32/FT4 = 1.52. What would cause these fluctuations?