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T3, Free, Tracer Dialysis
Test Code36598
CPT Codes
84480, 84481
Includes
Free T3 and T3, Total
Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL
Transport Container
Plastic screw-cap vial
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Equilibrium Dialysis by RIA • Immunochemiluminescence
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: Sun-Thurs; Report available: 5-8 days
Reference Range
Free T3
T3, Total
1-9 Years | 282-518 pg/dL |
10-13 Years | 286-556 pg/dL |
14-17 Years | 242-501 pg/dL |
Adult | 210-440 pg/dL |
Pregnancy (all trimesters) | 200-380 pg/dL |
T3, Total
<1 Month | Not established |
1-23 Months | 117-239 ng/dL |
2-12 Years | 105-207 ng/dL |
13-20 Years | 86-192 ng/dL |
>20 Years | 76-181 ng/dL |
Clinical Significance
T3 measurements are used to diagnose hyperthyroidism. This test can also be used to clarify thyroid status in the presence of possible protein-binding abnormalities.