ARUP's Laboratory Test Directory

Thyroxine : 0070140

Mnemonic: T4

Methodology: Electrochemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube or plasma separator tube.  Also acceptable:  One 3 mL lavender (EDTA).

Transport:  1 mL serum or plasma at 2-8°C. (Min: 0.5 mL)  Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport:  0.2 mL serum or plasma at 2-8°C.

Remarks:  Allow serum to clot completely at room temperature.  Separate serum or plasma from cells ASAP.

Unacceptable Conditions:  Grossly hemolyzed specimens.

Stability:  After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month
Reference Interval:
Cord blood: 6.6-17.5 µg/dL                          5-9 years: 6.4-13.3 µg/dL
1-7 days: 11.0-21.5 µg/dL                            10-14 years: 5.6-11.7 µg/dL
8-30 days: 8.2-16.6 µg/dL                            15-20 years: 4.2-11.8 µg/dL
1 month-4 years: 7.2-15.6 µg/dL                  21 years and older: 5.1-14.1 µg/dL
CPT Code(s): 84436
 
 

 

 

 
All ARUP Sites:        www.aruplab.com     ·     www.arupconsult.com     ·     www.arup.utah.edu     ·     www.childx.org     ·     www.utahblood.org