Your signature does not indicate you had radiation. Do you have a TSH from before you had cancer treatment? Normal TSH levels are between .40 and 5.40 according to my lab tests. I'm not even certain that having a 5.84 should have put you on meds since these TSH tests vary drastically. Iget one every three months. Do you have any symptoms of low or over active thyroid? A site that I used years ago is www.endocrineweb.com. It was very informative. You should try to keep TSH at the same level as it was before treatment assuming it was not outline before. .12 and .84 sound very low to me, ('I'm not a doctor), my normal is 2.8. Maybe you don't need the meds at all.

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