protein-bound iodine
noun
: the amount of iodine expressed in micrograms per 100 milliliters of blood serum that is precipitated with serum proteins and that serves as a measure of the activity of the thyroid gland
the protein-bound iodine in the normal human being ranges from 4 to 8 micrograms, in hypothyroidism falls below this range, and in hyperthyroidism rises above it
Cite this Entry
“Protein-bound iodine.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/protein-bound%20iodine. Accessed 29 Oct. 2025.
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