My daughter is hypothyroid we have been under endocrinologist since January she is currently taking 75mg levo daily she has improved greatly since January when Tsh was 197 and T4 5.8 but is still always cold and suffers headaches on a daily basis. she recently had thyroid function test at my request because she had high prolactin level of 775 (0-500) reference range. Her T4 was 15 and Tsh 16. This was done through GP and she said because T4 was normal her medication is fine. I am seeing endocrinologist in 2 week s. It has been my understanding that Tsh should be below 5. Do some people just have a high Tsh? or is my daughter undermedicated? Thanks for reading all advice much appreciated.