Finally on dose of synthroid to keep tsh down (currently around 4tsh) and free t4 normal. antibodies tpo came back at 1. what are other likely causes?

Please Clarify!: When you ask "What are the likely causes?", are you referring to thyroid disorders, elevated TSH or thyroid antibodies? Also, the antibody levels aren't reported as a single integer. They're reported either as "None Detected" or as a ratio, such as 1:2000. Recheck your lab report and report the results in one of those two ways. Thanks. Dr. Anne