Dear Ms Strafford
Thank you for your question. The antibody test is called anti-TPO test. It is different from T3, T4 and TSH
. If the antibodies
are positive then there is an increased chance of you becoming hypothyroid in the future. No one knows when. So, if antibody is positive thyroid testing can be periodically done ( every 6 months or so) to see the trend. Medication is not usually started based on the antibodies alone. Since you are already on thyroxine
for 18 years ( with dx of hypothyroidism
) doing this test will not add any more information. Thyroxine dose will not be titrated based on this test. Further it is also expensive and since it is not going to add anything more I would not recommend antibody testing.
Please write to me if any more questions.
Thanks a lot