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Endocrine Testing Summary of Clinical Indications

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Thyroid Scan

To relate the general structure of the thyroid gland to its function.
- may be useful in distinguishing Grave's Disease from toxic nodular goiter
To correlate thyroid palpatation with scintigraphic findings to determine the degree of function in a clinically-defined area or nodule.
To locate ectopic thyroid tissue
To assist in evaluation of congenital hypothyroidism
To evaluate a neck or substernal mass
To differentiate thyroiditis abd factitious hyperthyroidism from Grave's disease and other forms of hperthyroidism

Thyroid Uptake

Assist in determining the amount of I131 therapy to be given to treat hyperthyroidism due to Grave's disease or toxic nodular goiter
Differentiate subacute or painless thyroiditis and factitious hyperthyroidism from Grave's disease and other forms of hyperthyroidism
Assist in diagnosing hyperthyroidism
Uptake measurement is of limited value in the diagnosis of hypothyroidism

Parathyroid Scan

To localize hyperfunctioning parathyroid tissue (adenomas or hyperplasia) in primary hyperparathyroidism
To localize hyperfunctioning parathyroid tissue in patients with persistent or recurrent disease