Not recommended for routine thyroid screening.
Quantitative Electrochemiluminescent Immunoassay
Within 24 hours
Serum Separator Tube (SST). Also acceptable: Plasma Separator Tube (PST), Lavender (EDTA), Pink (K2EDTA), or Green (Sodium or Lithium Heparin).
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)
Grossly hemolyzed specimens.
After separation of cells: Ambient: 8 days; Refrigerated: 2 weeks; Frozen: 2 years
Thyroxine, Free (Free T4) (0070138) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests.
No compliance statements are in use for this test.
T3 uptake is of little clinical value alone; it is used to determine the Free Thyroxine Index.
|Component Test Code*||Component Chart Name||LOINC|
- T3 Uptake, S
- T3U, Serum
- Thyroid Binding Ratio
- Triiodothyronine Uptake, Serum