protein-bound iodine

protein–bound iodine

noun

Definition of PROTEIN-BOUND IODINE

: 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>