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3005977
T Uptake
T UPTAKE
Ordering Recommendation
New York DOH Approval Status
This test is New York state approved.
Specimen Required
Patient Preparation
Collect
Serum Separator Tube (SST). Also acceptable: 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 an ARUP Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature
Refrigerated.
Unacceptable Conditions
Grossly hemolyzed specimens.
Remarks
Stability
After separation of cells: Ambient: 8 days; Refrigerated: 2 weeks; Frozen: 2 years
Methodology
Quantitative Electrochemiluminescent Immunoassay (ECLIA)
Performed
Sun-Sat
Reported
Within 24 hours
Reference Interval
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.
Compliance Category
FDA
Note
T uptake is of little clinical value alone; it is used to determine the free thyroxine index.
Hotline History
Hotline History
Date of Change
Test Name Change
Methodology
Performance/Reported Schedule
Specimen Requirements
Reference Interval
Interpretive Data
Note
CPT Code
Component Change
Other Interface Change
New Test
Inactive
N/A
CPT Codes
84479
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 3005979 | T Uptake | 74795-6 |
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
- T3 Uptake
- T4 uptake, S
- T4U, serum
- TBC
- THBR
- Thyroid binding ratio
- Thyroxine-binding capacity
- Thyroxine-binding index
- Triiodothyronine uptake, serum
T Uptake
