A thyroid pertechnetate scan is used to image the thyroid and evaluate its function.
To differentiate among the causes of thyrotoxicosis, that is Graves' disease from subacute, silent, postpartum, or factitious hyperthyroidism
Evaluation of congenital hypothyroidism
To relate the general structure of the gland to function- differentiate Graves' disease from toxic nodular goiter
To locate ectopic tissue
To determine function in specific area - query if palpable nodule is functional