DefinitionThyroid function tests are common tests used to tell how well your thyroid is working.See the following articles for details:T3 testT3 resin uptakeT4 testThyroid scanTSH testReferencesLadenson P, Kim M. Thyroid. In: Goldman L and Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders; 2007:chap 244.