I was checking out mymedichecks results earlier and took a look at the info for Thyroid peroxidase antibodies and it mentions the following:
Thyroid peroxidase is an enzyme which is produced in the thyroid gland and is important for converting T4 to the biologically active T3. This test looks for antibodies to thyroid peroxidase which indicates that the body's immune system is attacking the thyroid gland and impairing its function
I have a problem with conversion and now take both T4 and T3 but I never knew the cause. Could high levels of the above be the reason why I don't do well on T4 alone ? If my antibodies are high on my current treatment should I perhaps try lowering T4 further and upping T3 ?