T3 (Triiodothyronine) Reverse
Order Name
REVERSE T3
Test Number: 2010900
Revision Date 09/05/2024
Test Number: 2010900
Revision Date 09/05/2024
| Test Name | Methodology | LOINC Code |
|---|---|---|
|
T3 (Triiodothyronine) Reverse
|
Liquid Chromatography/Tandem Mass Spectrometry | 3052-8 |
| SPECIMEN REQUIREMENTS | ||||
|---|---|---|---|---|
| Specimen | Specimen Volume (min) | Specimen Type | Specimen Container | Transport Environment |
| Preferred | 1.2 mL (0.8) | Serum | Clot Activator SST | Room Temperature |
| Instructions | Notes: 0.8 mL (Note: This volume Does NOT allow for repeat testing.) Specimen Type: Red-top tube OR gel-barrier tube Specimen Storage: Room temperature Specimen Collection: If a tube other than a gel-barrier tube is used, transfer separated serum to a plastic transport tube. Specimen Stability: Ambient: 14 days, Refrigerated : 14 days, Frozen: 14 days |
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| GENERAL INFORMATION | |
|---|---|
| Expected TAT | 4 - 6 days |
| Clinical Use | Reverse T3 (rT3) has limited application. The assay may be useful in the diagnosis of nonthyroidal illness (NTI). Patients with NTI have low T3 concentrations and increased concentrations of rT3. RT3 may be useful in neonates to distinguish euthyroid sick syndrome from central hypothyroidism. |
| Notes | Labcorp Test Code: 070104 |
| CPT Code(s) | 84482 |
| Service Provided By |  |
| Lab Section | Reference Lab |