High TSH can be caused by poor absorption of T4 supplementation.
I say this as someone who currently has a TSH of 44, up from 29, 6 weeks ago.
I have been advised to cut out all vitamin, herbal and calcium supplements, coffee, anything soy, and goitrogenic vegetables for a week to see if my number moves. All of these (per my dr) can cause problems with absorption and conversion of t4 to t3, causing a rise in TSH.
I feel normal, energetic, not hypo at all which is the weird part. I would not have known if I wasn't tested. Lol
If your ft3 & ft4 are in normal range, high TSH may be an absorption issue.
Edited AzGravesGuy (Jan. 25, 2017 04:28:46)