FT3 ANDTSH

The thyroid, a gland located in the neck, regulates metabolic processes in the body through the production of free triiodothyronine (FT3) and thyroxine (FT4). The free triiodothyronine is regulated by the thyroid hormone TSH, which is the thyroid-stimulating hormone produced by the pituitary gland. The free form means that it is not bound to plasma proteins.

TSH stands for thyroid stimulating hormone. A TSH test is a blood test that measures this hormone. TSH levels that are too high or too low may be a sign of a thyroid problem. The thyroid is a small, butterfly-shaped gland in the front of your neck. Your thyroid makes hormones that control how your body uses energy.