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Thyroxine
0070140
Ordering Recommendation

Not recommended for routine thyroid screening.

Mnemonic
T4
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).  
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 from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month  
Reference Interval
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


Note
CPT Code(s)
84436
Components
Component Test Code*Component Chart NameLOINC
0070140Thyroxine3026-2
* 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
  • Syn-Thyroid
  • T4
  • T4 Total Only,  T4, Serum
  • Tetraiodothyronine
  • Thyroid Hormone
  • Thyroxine (T4)
  • Total T4