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Free T3/Reverse T3 Ratio (BU Specific)
Test Code4755v1
CPT Codes
84481, 84482<br>Restricted Client Code
Preferred Specimen
2 mL serum [x2]
Minimum Volume
0.9 mL [x2]
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated; 7 days
Frozen: 28 days
Refrigerated; 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Unseparated serum (>48 hours on clot) • Serum in serum separator tube (SST) not separated from gel within 24 hours
Methodology
Immunochemiluminometric • Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) • Ratio Calculation
Setup Schedule
Set up: Daily; Report Available: 4 days
