As Charm points out, getting your TSH level before you start treatment is a very good idea. This was SOP where I was treated back in 1997. I don't know why it wouldn't still be but it is always good to ask to make certain it happens. They also ususally monitor it during treatment.

However, that is not the end of it. Since your thyroid may decide to go haywire any time from during treatment to many years later, you will also need your GP to run your TSH levels every 6 months or at least once a year or if you are experiencing symptoms. Mine went really 'out of whack' after my surgery in 2001 and I had no sypmtoms. I could have been in deep troubole were it not for the routine check ups. Your GP can have this done anytime he does a blood draw for something else.

Take care,
Eileen

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Aug 1997 unknown primary, Stage III
mets to 1 lymph node in neck; rt ND, 36 XRT rad
Aug 2001 tiny tumor on larynx, Stage I total laryngectomy; left ND
June 5, 2010 dx early stage breast cancer
June 9, 2011 SCC 1.5 cm hypo pharynx, 70% P-16 positive, no mets, Stage I