radioactive iodine test radioactive iodine excretion test • radioactive iodine uptake test · · · Info · Definitions · Characters · · radioactive iodine test · · Text Common · · Latin · · Scripts 23 · · Length 7 · · Syllables Definitions · · · (noun) test of thyroid function in which the patient is given an oral dose of radioactive iodine-131. Synonyms: radioactive iodine test. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076