I had a chance to visit endocrinologist abroad and she said I should reduce my TSH level to at least 2.5 (from 2.71 currently) before trying to conceive, to avoid problems with the health of the baby. She said, I can achieve this by increasing my L Thyroxin dose to 125 micrograms (currently I'm taking 100 micrograms). My TSH level used to be much higher in the past. When it dropped to 3.71 around a year ago, my GP said my Thyroid function is normal and I can start trying. I am worried about so big differences in what the two doctors suggest. What is the correct reference level here? If I really need to switch to L Thyroxin 125mg, how do I convince my GP to prescribe it to me, since he is sure my Thyroid function is normal? Many thanks in advance!