The thyroid gland, located in the neck, is responsible for maintaining the energy levels in the body. It also controls the bodys reaction to other hormones. This gland produces a hormone known as the triiodothyronine or T3. Some of the T3 hormone binds itself to body protein while some of it remains unbound. The Triiodothyronine Total test measures both these types T3 in the blood. This test indicates any and all kinds of thyroid problems. Its primary use is to detect the condition of hyperthyroidism. It also helps the doctor in prescribing the treatment for other thyroid disorders.