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T4 Free, Direct Dialysis : 35167
Test CodeT4DIRQ or 35167
Alias/See Also
Direct Free T4, Free Thyroxine, Free T4 By Equilibrium Dialysis, FT4 Direct Dialysis,Thyroxine, Free By Direct Dialysis, Free T4 Direct Dialysis
CPT Codes
84439
Instructions
Fasting preferred
Please specify the patient's age on the request form
Please specify the patient's age on the request form
Transport Container
Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL
1 mL serum
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated.
Specimen Stability
Room temperature: 4 days; Refrigerated: 14 days; Frozen: 35 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Lipemia, Heparin plasma, EDTA plasma
Methodology
Equilibrium Dialysis, Chromatography/Mass Spectrometry
Setup Schedule
Monday - Saturday
Report Available
3-4 days (From receipt at performing Laboratory)
Limitations
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Reference Range
Reference Ranges
Adult 0.9-2.2 ng/dL
Prematures, 25-30 Weeks
Birth-7 Days 0.5-3.3 ng/dL
Prematures, 31-36 Weeks
Birth-7 Days 1.3-4.7 ng/dL
Cord Blood, >37 Weeks 1.2-2.2 ng/dL
Birth-4 Days 2.2-5.3 ng/dL
2 Months-2 Years 1.2-2.5 ng/dL
3 Years-17 Years 1.0-2.4 ng/dL
Pregnancy
First Trimester 0.9-2.0 ng/dL
Second Trimester 0.8-1.5 ng/dL
Third Trimester 0.8-1.7 ng/dL
Clinical Significance
Useful for the differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or for the differential diagnosis of euthyroid hypothyroxinemia from hypothyroidism.
Performing Laboratory
Quest Diagnostics