Thyroxine, Free by Equilibrium Dialysis


Abbrev Code:FT4DL   
Order Code:LAB6046Order 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 Codes: 84439 x1
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. It has not been cleared or approved by the U.S. Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.


Collection Instructions

Specimen:Blood
Optimal Volume:4 mL
Minimum\Peds Volume:0.8 mL
Container:Red (no gel)
Alternate Containers: 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.
Stability:After separation from cells: 4 days at room temperature; 2 weeks refrigerated; 1 month frozen.
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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