iv been on T3 25mg only now for 4 mths I confessed to my GP i self medicate after many years of being unwell and T4 not working . I had a blood test but took my T3 by mistake so result was T3 8.9 ref 3.5-7.7 TSH 36. Why do they do TSH when on T3 only ? she wants me to add 50 mg of T4 which worries me as this will push up T3 she said it wouldnt . how do i prepare for a blood test that will be acceptable in ref range but not mess up my self meds as i feel better than i have in many years. Best mention iv had TT due to graves.