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Thyroid Panel
0070141
Ordering Recommendation

Not recommended for routine thyroid screening.

Mnemonic
T7
Methodology
Quantitative Electrochemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
 
Collect
Serum separator tube or plasma separator tube. Also acceptable: Lavender (EDTA), pink (K2EDTA), or green (sodium or 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: 24 hours; Refrigerated: 1 week; Frozen: 1 month  
Reference Interval
                         
Test Number
Components
Reference Interval
 Free Thyroxine Index CalculationFTI 1.7-4.2
0070135T3 Uptake28-41% uptake
0070140Thyroxine
Cord blood6.60-17.50 µg/dL
0-3 days5.37-22.40 µg/dL
4-30 days5.24-23.20 µg/dL
1-23 months5.37-16.00 µg/dL
2-6 years5.26-14.80 µg/dL
7-11 years5.70-14.10 µg/dL
12-19 years4.74-14.60 µg/dL
20 years and older5.10-14.10 µg/dL


Interpretive Data
Thyroxine, Free (FT4) (0070138) is the preferred test alternative for T3 uptake and Free Thyroxine Index tests.


Note
FTI  = Free Thyroxine Index
CPT Code(s)
84479; 84436
Components
Component Test Code*Component Chart NameLOINC
0070135T3 Uptake3050-2
0070140Thyroxine3026-2
0070196Free Thyroxine Index Calculation32215-6
* 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
  • T3 uptake
  • T7
  • thyroxine
  • Thyroxine Index