Aids in the calculation of Free T4 (thyroxine).
The T3 Uptake test helps calculate the Free thyroxine index. This is calculated from an estimation of Free T4, which is determined from the Total T4 test and an estimation of thyroid binding proteins.
Recommended with T3 Uptake
Is Fasting Required? No
More Information: http://www.questdiagnostics.com/testcenter/TestDetail.action?ntc=861