ARUP's Laboratory Test Directory

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

Mnemonic: FT3 ED-TMS

Methodology: Quantitative Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry
Performed: Mon-Fri
Reported: 2-5 days
Specimen Required: Collect: Plain red.

Specimen Preparation: Transfer 2 mL serum to an ARUP Standard Transport Tube. (Min: 0.3 mL)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): After separation from cells: Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 1 month
Reference Interval:
Effective May 16, 2011
Free Triiodothyronine pg/mL
Age Female Male
6 month-6 years 3.8-8.5 pg/mL 3.7-7.7 pg/mL
7-12 years 3.6-6.5 pg/mL 3.7-6.4 pg/mL
13-17 years 2.9-5.6 pg/mL 3.4-6.1 pg/mL
18 years and older 3.2-6.6 pg/mL 3.2-6.6 pg/mL
Pregnancy,1st Trimester 3.0-5.7 pg/mL
Pregnancy, 2nd Trimester 2.3-5.6 pg/mL
Pregnancy, 3rd Trimester 3.0-5.7 pg/mL

Interpretive Data:

See Compliance Statement B: www.aruplab.com/CS
CPT Code(s): 84481
Cross References: Direct Dialysis (Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry), FT3 (Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry), T3, Free, Equilibrium Dialysis (Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry) , Triiodothyronine, Free (FT3), Dialysis and LC/MS-MS (Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry)