#radioactive_iodine_test  test of thyroid function in which the patient is give an oral does of radioactive iodine-131
  supertype:  #diagnostic_test__test__diagnostic_assay  an assay conducted for diagnostic purposes
  subtype:  #radioactive_iodine_excretion_test  radioactive iodine test that measures the amount of radioactive iodine excreted in the urine
  subtype:  #radioactive_iodine_uptake_test__RAIU  radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland

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