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Common Mayo Medical Laboratories Test-Ordering Errors
Part 4: Overordered Tests

JAK2 on Blood and Bone Marrow
Free Thyroxine index (FTI) and T3 Uptake


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Assessing Thyroid Hormone Status in the Presence of Abnormal Binding Proteins

Slide 8

July 2010

Hence, laboratory tests have been developed to compensate for the presence of abnormal types or quantities of thyroxine-binding proteins.  The first of these was the free thyroxine index (FTI) and the T3 uptake test, which were developed in the 1950s. These tests came into use years before the  free T4 assays we use today were technically possible, and they provided the first laboratory assessment of the amount of biologically active form of thyroxine.

Assessing Thyroid Hormone Status


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