Abstract
ELEVATION of the serum protein-bound-iodine level (PBI) from extraneous causes not related to thyroid disease has received considerable attention; false depression of this valuable index has received less notice. Although administration of androgens, tri-iodothyronine, diphenylhydantoin and salicylates are known to cause moderate depression of PBI levels, only mercury administration is commonly recognized as a cause of very low values.1 We were recently called upon to interpret the meaning of a PBI measurement of 1.3 microgm. per 100 ml. obtained from a patient two days after intravenous urography had been performed. A review of her history revealed that she had received . . .
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