Test Catalog

Test ID: FRTUP    
Free Thyroxine Index (FTI), Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Estimating the amount of circulating free thyroxine (free thyroxine index) using the total thyroxine and thyroid binding capacity (T-uptake)

Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.

Test IDReporting NameAvailable SeparatelyAlways Performed
TUPCThyroxine Binding Capacity, SNoYes
T4SThyroxine, Total, SYes, (order T4)Yes
FRTIFree Thyroxine IndexNoYes

Method Name A short description of the method used to perform the test

Electrochemiluminescence Immunoassay

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Free Thyroxine Index(FTI), S

Aliases Lists additional common names for a test, as an aid in searching

Thyroxine Binding Capacity-TBC
Thyroxine Binding Index-TBI