Welcome to HCM.
Taking thyroid medicine on the day of test doesn't alter test result as the result indicates your controlof thyroid over past few weeks. The results are not inconclusive, in fact high thyroid perioxidase indicate risk of developing hypothyroidism
. After initiating any thyroid medication, its better to do TSH
after 4-8 weeks, preferably after 8 weeks. Same is true after adjusting dose of thyroid medicine. You can just recheck TSH after 5 more weeks & if TSH is still high, increase dose pf symthroid.
Wish you good health.