Hi , I was hypothyroid, and took Levothyroxine 50 Cg, On July TSH = 0.45. My doctor told take one more monthy . Then Sept , level TSH= 0.006. Doctor told stop Levothyroxine and Oct, lab test again as below . I am hyperthyrod now. and Recommend starting methimazole 10mg twice a day x 2 weeks then 10mg once a day. Should I take medication or not? Why I from hypothysoid to Hyperthyroid just one month. Is TSI = 6.8 grave disease? Thanks you for your help. Gina ------- TSI = 6.8 REFERENCE VALUE------------ ---------------------- Free T4 0.6 - 1.6 ng/dL 2.2 ----------------------- T3, Free 2.3 - 4.2 pg/mL 8.2 -------------------------------- TSH 0.40 - 4.0 mIU/L