Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Your fluctuating TSH in both the tests is higher than the range and this means Hypothyroidism. Your fT4 is in a normal range and in this circumstances,you may have Subclinical Hypothyroidism.But to confirm the diagnosis it is necessary to do even the Ft3 tets. The most common cause of Hypothyroidism is Hashimoto s thyroiditis and the anti TPO test will clarifie the diagnosis. So to resume,if you were my patient i will ask you to do the fT3 test and the TPO antibodies. These test will give all the necessary information if your thyroid is functionin properly and what is the cause of your thyroid disorder. In my opinion you don t have a pituitary problem.The fluctuating TSH is the result of your thyroid disorder. Hope I have answered your query. Let me know if I can assist you further.