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HelpTest ID BLOD0212 T4, Free, Direct Dialysis
Specimen Type
SerumSpecimen Required
Patient Preparation:
Fasting: 8-16 hours, preferred but not required
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collections Instructions:
1. Centrifuge and aliquot 1 mL of serum into a plastic vial.
2. Send refrigerated.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated (preferred) | 14 days |
| Frozen | 35 days | |
| Ambient | 4 days |
Reject Due To
| Lipemia | Reject |
| Heparin plasma | Reject |
| EDTA plasma | Reject |
Day(s) Performed
Monday through Saturday
Report Available
4 to 8 daysMethod Name
Equilibrium Dialysis, Chromatography/Mass Spectrometry
Reporting Name
T4, Free, Direct DialysisPerforming Laboratory
Quest Diagnostics Nichols InstituteSecondary ID
91548CPT Code Information
84439
Reference Values
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 to 2 years: 1.2-2.5 ng/dL
3 to 17 years: 1.0-2.4 ng/dL
Adult: 0.9-2.2 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
Test Classification
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. The assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.Useful For
Differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or hypothyroidism
SANFORD LABORATORY INTERFACE BUILD INFORMATION
| Result Code | Result Code Description |
|---|---|
| 3840 | T4 Free Direct Dialysis |