T4 Free, Direct Dialysis QFT4DI

Method(s) Equilibrium Dialysis, Chromatography/Mass Spectrometry
Synonym Direct Free T4, Free Thyroxine, Free T4 By Equilibrium Dialysis, FT4 Direct Dialysis, Thyroxine, Free By Direct Dialysis, Free T4 Direct Dialysis
Specimen Required
Collect

One 5 mL gold (SST) top tube.

Transport

1 mL serum ambient (Min: 0.5 mL)

* Collection Instructions *

Please specify the patient's age on the request form.

Remarks

Patient Preparation: Fasting preferred

Stability

Ambient: 4 days

Refrigerated: 14 days

Frozen: 35 days

Unacceptable Conditions
  • Lipemia
  • Heparin plasma
  • EDTA plasma
Schedule Mon-Sat
CPTCode 84439
Notes Performing Laboratory-Quest Diagnostics-Chantilly VA
Preferred Specimen Collection Device(s)
Reference Interval
 
Adult0.9-2.2 ng/dL
Prematures, 25-30 Weeks
Birth-7 days0.5-3.3 ng/dL
Prematures, 31-36 Weeks 
Birth-7 days1.3-4.7 ng/dL
Cord Blood, Greater than 37 Weeks1.2-2.2 ng/dL
Birth-4 Days2.2-5.3 ng/dL
2 Months-2 Years1.2-2.5 ng/dL
3 Years-17 Years1.0-2.4 ng/dL
Pregnancy 
First Trimester0.9-2.0 ng/dL
Second Trimester0.8-1.5 ng/dL
Third Trimester0.8-1.7 ng/dL
No Appointment Necessary
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12 Patient Service Centers in Central New York.

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