Home
HelpEpic Test Code LAB4932 T Uptake (Thyroxindex)
Additional Codes
ARUP: 3005977
Performing Location(s)
ARUP
Ordering Recommendation
Not recommended for routine thyroid disorder screening; for initial screening, refer to Thyroid Stimulating Hormone (0070145).
The preferred alternative to this test is Thyroxine, Free (Free T4) (0070138).
Specimen Type
Serum or Plasma
Preferred Container
Gold Top Serum Separator Tube (SST).
Alternative Container
Lavender (K2EDTA or K3EDTA), pink (K2EDTA), or green (lithium heparin).
Specimen Preparation
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 a Transport Tube. (Min: 0.5 mL)
Transportation Needs
Refrigerated.
Storage Requirements
Refrigerated.
Specimen Stability
Ambient:8 Days
Refrigerated: 2 Weeks
Frozen: 2 Years
Causes for Rejection
Mislabeled or unlabeled specimen
Less than 50% draw for vacutainer tubes
Grossly hemolyzed specimens
Reference Range
0.8-1.3 TBI
Interpretive Data
Thyroxine, Free (Free T4) (0070138) is the preferred test alternative for T Uptake and Free Thyroxine Index tests.
Turnaround Time
Within 24 hours
Days of Analysis
Sun-Sat
Available STAT
No
CPT Code
84479
Methodolgy
Quantitative Electrochemiluminescent Immunoassay
Last Updated
21-Mar-23 MS