Thyroid Tests

As the name implies, thyroid tests evaluate the function of the thyroid gland. Too little thyroid hormone (hypothyroidism) is common in dogs whereas too much thyroid hormone (hyperthyroidism) is common in older cats. Because there is no single thyroid test that can diagnose all thyroid diseases in animals, several different thyroid tests are used to assure proper results (T4, T3, Free T4, etc.).