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Test Name:
T3, Free, by ED/HPLC-MS/MS
- SBMF No:
45361 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
FT3 ED-TMS - ABN:
Not required - CPT Code:
84481 - LOINC Code:
29239-1 - Ref Lab Test No:
0093243 - Also Known As:
Free T3, by Dialysis
Free Triiodothyronine, by Dialysis
FT3, by Dialysis
Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry - Also See:
30016 T3, Free - Spec Type:
Serum - Spec Container:
Red top (serum) tube - Pref Vol:
2.0 mL - Min Vol:
0.3 mL - Fasting:
No - Spec Collect:
Avoid use of separator tubes or gels
Routine venipuncture - Spec Process:
Clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum to separate plastic tube - Spec Store Transport:
Refrigerated - Spec Stability:
After separation from cells:
4 days room temperature (20-30°C)
2 weeks refrigerated (2-8°C)
1 month frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Methodology:
Quantitative Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry - Clinical Significance:
Refer to:
- Reference Range:
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 - Day Run:
Mon-Fri - Time Reported:
3-6 days - Test Type:
HORMONE
