Recent investigation report shows FT3 2.9Pg/ml (ref range- 2.0 - 4.4) FT4 1.0 ng/dl (ref range- 0.93 - 1.7) TSH 11.6 IU/ml (ref range- 0.27 - 4.2). Doctor has prescribed company - macleods pharmaceuticals ltd, thyroxine sodium tablet - Thyrox-50. Am I on right treatment?