title: Changes in the normal range of thyroidal radioiodine uptake.
abstract: Three series of patients shown to be euthyroid but originally referred for thyroid uptake tests in vivo have been compared. In 1958-59, the ;normal' mean thyroid uptake was 23.5% and 38.2% respectively at four and 24 hours. By 1967, the mean uptakes had dropped to 20.4% and 31.6%-a significant change at both times. By 1972 there was, however, no sign of a further reduction of the mean normal values for thyroid uptake. These results are compared with changes observed in other series in the USA and elsewhere.
mesh_terms: D001939:Bread; D004032:Diet; D005503:Food Additives; D006801:Humans; D007457:Iodine Radioisotopes; D008131:London; D013959:Thyroid Diseases / Q000175:diagnosis; D013960:Thyroid Function Tests; D013961:Thyroid Gland / Q000378:metabolism*; D013997:Time Factors; D014481:United States
chemical_list: D005503:Food Additives; D007457:Iodine Radioisotopes