T4 and T3 Tests

The importance of thyroid function testing

The importance of thyroid function testing

The thyroid gland, a butterfly-shaped organ located in the neck, produces hormones that influence nearly every cell in your body. These hormones, primarily thyroxine (T4) and triiodothyronine (T3), regulate metabolism, body temperature, heart rate, and more. When the thyroid gland malfunctions, it can lead to a variety of health problems, such as hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid).