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TSH levels after TT

I had TT almost one year ago for multinodular goiter and then found papillary cancer.  My Synthroid dose was adjusted twice until I hit near the range posted by the lab.  I've been on the same dose of Synthroid and my TSH has gone from .46 to .005.  My FT4 and FT3 are "in range".  Why would my TSH change so drastically with changing dosage?
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168348 tn?1379357075
my levels keep changing and I had a partial; it's been 3 yrs.  all tests are ok for me.  My Endo does my thyrogloblins ev 6 mos just to be certain there's no interim change.

They don't know is what I was told in my case.

C~

PS   my antibodies are zero
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Avatar universal
oops, WITHOUT changing dosage.
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