Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Synonyms
RT3; Triiodothyronine Reverse; rT3; Reverse Triiodothyronine; Revers T3
Specimen Type
Serum or Plasma
Performing Lab
Quest Diagnostics San Juan Capistrano
Epic ID
LAB4410
Lab Test Days
Tuesday-Saturday
Standard TAT
5-6 Days
Collection Information
Specimen Required
1-2 mL Blood
Container Type
Red Top (No Additive)
Collection Instructions
Plasma collected in EDTA (lavender-top) or sodium heparin (green-top) tube is also acceptable.
Processing Information - Lab Use Only
Transport Temperature
Refrigerate-OK/Frozen-OK/Ambient-OK
Specimen Stability
Room Temp: 7 Days; Refrigerated: 7 Days; Frozen: 30 Days
Rejection Criteria
Unseparated serum (>48 hrs on clot); Serum in Serum Separator Tube (SST) not separated from the gel within 24 hours
Test Volume Required
0.5 mL Serum or Plasma
Minimum Test Volume
0.3 mL Serum or Plasma
Processing Instructions
Allow blood to clot at room temp for 30 minutes. Centrifuge and separate the serum from the cells immediately. Alternatively, collect blood in a gel barrier tube, allow to clot at room temp, centrifuge, and remove from gel within 24 hours.
CPT Codes
84482
Revised
01-13-16
Initials
SL