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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
T4 Free, Direct Dialysis and T4 Total
Test Code36725
CPT Codes
84436, 84439
Preferred Specimen
2 mL serum
Patient Preparation
Fasting preferred
Minimum Volume
1 mL
Instructions
Please specify on the request form the patients age.
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Lipemia • Heparin plasma • EDTA plasma
Methodology
Equilibrium Dialysis • Chromatography/Mass Spectrometry • Chemiluminescence (CL)
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Mon-Sat a.m.; Report available: 4-5 days
Reference Range
T4, Free Direct Dialysis
T4, Total
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 |
T4, Total
<1 Month | Not established |
1-23 Months | 6.0-13.2 mcg/dL |
2-12 Years | 5.5-12.1 mcg/dL |
13-20 Years | 5.5-11.1 mcg/dL |
>20 Years | 4.8-10.4 mcg/dL |
Pregnancy | |
First Trimester | 6.4-15.2 mcg/dL |
Second Trimester | 7.4-15.2 mcg/dL |
Third Trimester | 7.7-13.8 mcg/dL |
All TrimestersTogether | 7.0-14.7 mcg/dL |
Clinical Significance
For the differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or for the differential diagnosis of euthyroid hypothyroxinemia from hypothyroidism.
Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA |
33608 Ortega Highway |
San Juan Capistrano, CA 92675-2042 |