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Uptodate Reference Title
T3-resin test in TBG deficiency
T3-resin test in TBG deficiency
The radiolabeled T3 (*T3) cannot bind to diminished or absent TBG; as a result, the amount left over to bind to the resin is higher than normal. The serum total T4 is low; the T3-resin uptake and THBR are high, and the serum free T4 index is normal.