KTRK-TV Houston-Stay on top of the latest breaking news, weather and traffic with the ABC13KTRK app. It's the information you need to know in an app that's fun and easy to use.
Four tests â thyroid-stimulating hormone (TSH), Free T3, Free T4 and thyroid antibodies â are required to accurately assess the function of the thyroid gland, our master gland of metabolism. An optimal TSH level should be less than 2.0, not the currently accepted 4.7 reported by most labs.
Common medications that affect thyroid and antibody blood tests are: 1  lithium: thyroid antibodies have been found with intake of lithium. 2  Lithium is concentrated in the gland and interferes with thyroid hormone synthesis/release and an increase in thyrotropin levels.