131I uptake test

131I up·take test

a test of thyroid function in which iodide 131 is given orally; after 24 hours, the amount present in the thyroid gland is measured and compared with normal values.

131I up·take test

(ŭp'tāk test)
A test of thyroid function in which 131I-iodide is given orally; after 24 hours, the amount present in the thyroid gland is measured and compared with normal values.