Thyroid Function Test (TSH)The thyroid is a butterfly shaped gland located in the front of your neck, responsible for regulating key bodily functions. Controlled by the pituitary gland, TSH (Thyroid Stimulating Hormone) prompts the thyroid to produce T3 and T4 hormones, which influence how your body uses energy, produces proteins, and regulates critical processes such as: Body temperature Heart rate Breathing Skin moisture Muscle function Weight management Brain development