[154] "Classic" uptake assays used T3 tracer because the lower T3-TBG binding affinity relative to T4-TBG resulted in a higher isotopic uptake by adsorbant and thus shorter counting times.

MANY patients receive iodine-containing medication that can alter the results of concomitantly performed determinations of radioiodine uptake or serum protein-bound iodine. When the iodine is an ...