Thyroxine, Free by Equilibrium Dialysis


Sunquest Code:FT4DL  
Epic Code:LAB6046Epic Name:Thyroxine, Free by Equilibrium Dialysis
Synonyms:Direct Dialysis (Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry); FT4, T4, Free, Equilibrium Dialysis
Methodology:Equilibrium dialysis, High performance liquid chromatography-Tandem mass spectrometry
CPT Code:84439
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 2-5 days.
Compliance:

This test was developed and its performance characteristics determined by ARUP Laboratories. The U.S. Food and Drug Administration has not approved or cleared this test; however FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.



Collection Instructions

Specimen:Blood
Optimal Volume:4 mL
Minimum\Peds Volume:0.8 mL
Container:Red (no gel) (Red or gold (gel))


Processing and Shipping

Specimen Processing:Centrifuge and aliquot within 2 hours of collection, 2 mL, 0.3 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:93244


Interpretive

Reference Range:

Age

Female

Male

25-30 w gestation

0.5-3.3 ng/dL

0.5-3.3 ng/dL

31-36 w gestation

1.3-4.7 ng/dL

1.3-4.7 ng/dL

Birth to 1 w

2.2-5.3 ng/dL

2.2-5.3 ng/dL

2-3 w

0.9-4.0 ng/dL

0.9-4.0 ng/dL

1-5 mo

1.1-2.2 ng/dL

1.1-2.2 ng/dL

6 mo-6 y

1.4-2.7 ng/dL

1.4-2.7 ng/dL

7-17 y

1.1-2.0 ng/dL

1.1-2.0 ng/dL

18 y 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

 

 

 



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