ARUP's Laboratory Test Directory

0093243: Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry

Test Mnemonic: FT3 ED-TMS
Methodology: Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry

Performed: Mon-Fri

Reported: 2-5 days

Specimen Required:  
Collect: One 5 mL plain red.

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

Pediatric Collection/Transport: 0.5 mL serum at 2-8°C.

Remarks: Avoid use of serum separator tubes or gels.

Stability: After separation from cells: Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 1 month

Reference Interval:
 
Age Triiodothyronine pg/mL
1-9 years:
10-13 years:
14-17 years:
18 years and older: 		4.2-7.8 pg/mL
4.3-8.3 pg/mL
3.6-7.5 pg/mL
3.2-6.6 pg/mL
Pregnancy:
1st Trimester:
2nd Trimester:
3rd Trimester: 		Pregnancy:
3.0-5.7 pg/mL
2.3-5.6 pg/mL
3.0-5.7 pg/mL

CPT Code(s):
84481

 

 

 
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