Ordering Recommendation
Mnemonic
FTIP
Methodology
Quantitative Electrochemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect
Serum separator tube. Also acceptable: Lavender (K2EDTA or K3EDTA), pink (K2EDTA), or green (lithium heparin).
Specimen Preparation
Allow specimen to clot completely at room temperature. Separate serum or plasma 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: 4 days; Refrigerated: 8 days; Frozen: 1 year
Reference Interval
Test Number |
Components |
Reference Interval |
||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
T Uptake | 0.8-1.3 TBI | |||||||||||||||||
Thyroxine, Total T4 |
|
|||||||||||||||||
Free Thyroxine Index Calc | 4.8-12.7 ug/dL |
Interpretive Data
Thyroxine, Free (FT4) (0070138) is the preferred test alternative for T Uptake and Free Thyroxine Index tests.
Compliance Category
FDA
Note
FTI = 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; 84436
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
3005979 | T Uptake | 74795-6 |
3005980 | Thyroxine, Total T4 | 3026-2 |
3005981 | Free Thyroxine Index Calc | 32215-6 |
* 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
- Free thyroxine index
- FT4 index
- FTI
- T4 uptake
- T7
- Thyroxine index
Free Thyroxine Index Panel