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Test Name:
T4, Free, by ED/HPLC-MS/MS
- SBMF No:
45360 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
FT4 ED-TMS - ABN:
May be required – Medical Necessity - CPT Code:
84439 - LOINC Code:
6892-4 - Ref Lab Test No:
0093244 - Also Known As:
Free T4, by Dialysis
Free Thyroxine, by Dialysis
FT4, by Dialysis
Thyroxine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry - Also See:
30113 T4, 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 Thyroxine ng/dL Age Female Male 25-30 weeks gestation 0.5-3.3 ng/dL 0.5-3.3 ng/dL 31-36 weeks gestation 1.3-4.7 ng/dL 1.3-4.7 ng/dL Birth to 1 week 2.2-5.3 ng/dL 2.2-5.3 ng/dL 2-3 weeks 0.9-4.0 ng/dL 0.9-4.0 ng/dL 1-5 months 1.1-2.2 ng/dL 1.1-2.2 ng/dL 6 months-6 years 1.4-2.7 ng/dL 1.4-2.7 ng/dL 7 years-17 years 1.1-2.0 ng/dL 1.1-2.0 ng/dL 18 years and older 1.1-2.4 ng/dL 1.1-2.4 ng/dL Pregnancy, 1st Trimester 0.7-2.0 ng/dL Pregnancy, 2nd Trimester 0.7-2.1 ng/dL Pregnancy, 3rd Trimester 0.5-1.6 ng/dL - Day Run:
Mon-Fri - Time Reported:
3-6 days - Test Type:
HORMONE
