Thyroxine free, dialysis/mass spectrometry

Alphabetical Test listing

Thyroxine free, dialysis/mass spectrometry-994

  
Thyroxine free, dialysis/mass spectrometry
  
994
  
LAB994
  
MSO
  
T4 free, dialysis/mass spectrometry
Free T4 by equilibrium
  

Free Thyroxine is used to evaluate thyroid gland function and to diagnose thyroid disease, as well as to monitor effectiveness of thyroid hormone treatment.

  
Serum
  
  
1.0 mL
  
0.5 mL
Note: This volume does not allow for repeat testing
  

Spin, separate and freeze within 45 minutes of sample collection

  
EDTA plasma
  
  

Frozen (preferred) - 453 days

Refrigerated - 5 days

Ambient - 2 days

  
Esoterix Endocrinolgy (500329) via LabCorp (501902): R-NX
  
Mo - Fr
  
4 - 5 days
  

Direct dialysis mass spectrometry

High pressure liquid chromatography/mass spectrometry (HPLC/MS)

  
Age Range (ng/dL)
Premature (0-4 wks) 0.86−4.46
Newborn 0–2 wks 0.84−4.97
2 weeks – 12 months 0.81 – 2.12
1 – 11 years 0.65 – 1.9
Pubertal children and adults 0.8 – 1.7
Pregnant female  
First trimester          (0 – 13.3 wk) 0.65 – 1.4
Second trimester (13.4 – 26.6 wk) 0.5 – 1.3
Third trimester   (>26.6 wk) 0.5 – 1.1
  
84439
  
Yes
  
  
Result 6892-4
  
05/22/2019
  
12/16/2019