Triiodothyronine, Free (FT3), Dialysis and LC-MS/MS
Test Code: 503600
Performing Lab: LabCorp
CPT Code: 84481 001
Synonym
Free T3; Free Triiodothyronine (T3); FT3
Specimen Type
Serum (preferred) or plasma, FROZEN
Specimen Container
Red-top tube, gel-barrier tube, lavender-top (EDTA) tube or green-top (sodium heparin) tube
Volume
1.0 mL
Minimum Volume
0.3 mL (Note:This volume does NOT allow for repeat testing).
Specimen Handling
Serum/plasma must be separated from cells within 45 minutes of venipuncture. Send serum/plasma in a plastic transfer tube.
Unacceptable Conditions
Whole blood
Temperature
FREEZE (preferred) or refrigerate Stability: Room temperature up to 5 days Refrigerated up to 5 days Frozen: up to 70 days
Methodology
Equilibrium Dialysis & high-pressure liquid chromatography/ tandem mass spectrometry (HPLC/MS-MS)
TAT
6 - 10 days
| Result Code | Result Name | LOINC |
|---|---|---|
| 503601 | T3, Free, Dialysis, LC/MS-MS | 29239-1 |
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