The elevated TSH means that the brain is interpreting the thyroid balance in the body as LOW and requesting (via Thyroid Stimulating Hormone - TSH) that the thyroid increase its production. If this is the only abnormal TSH you have had (and you are feeling otherwise okay) then I would wait 4-6 weeks and repeat the TSH, free T4 and obtain anti-TPO and anti-Tg antibodies. If the TSH is still high, then treatment should be considered. The antibodies will confirm the anticipated diagnosis of Hashimoto's (increased risk in T1DM) which is an autoimmune attack against the thyroid. The elevated glucose in most cases did not interfere with the TSH.