Gold
Serum
Allow clot, separate < 2hrs
Grossly hemolyzed specimens.
REFRIGERATED
T uptake is of little clinical value alone; it is used to determine the free thyroxine index
Sun-Sat
Within 24 hours
Quantitative Electrochemiluminescent Immunoassay (ECLIA)
Core
IHC
Free thyroxine index
FT4 index
FTI
T4 uptake
T7
Thyroxine index
T4 uptake, S
T4U, serum
TBC
Thyroid binding ratio
Triiodothyronine uptake, serum
THBR
Thyroxine-binding capacity
Thyroxine-binding index
T3 Uptake
Test
Avoid hemolysis
Allow specimen to clot completely at room temperature. Separate from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
84479
74795-6
