<s>[INST] In novemger 2008 I had a cancerous thyroid removed and following January had Radioactive Iodine treattment. Am now on Calchew (2 tablets daily ) plus 175 mcg Levothyroxine. My oncologist gave me a blood test in December 2010 and saw me  4/07/11. My GP arranged blood test 26 July  with result T4 = 26.5pmol/L. Ifeel reasonably fit. I am 80+ years. May I have your opinion, please? [/INST] Better see S.TSH rather than T4, if TSH is normal, u DONT need to worry. I hope I solved ur query.... </s>