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A 24-hour thyroid uptake test of sodium iodide I131 performed on 66 euthyroid subjects in Chicago has been analyzed. The new normal range, based on mean ± 2 standard deviations is 7% to 33%, which could explain the discrepancies between patient's clinical status and the results of the uptake test if data previously considered normal (15% to 45%), were applied.
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Gary G. Ghahremani (1971) studied this question.
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