Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
RT3; Triiodothyronine Reverse; rT3; Reverse Triiodothyronine; Revers T3
Serum or Plasma
Quest Diagnostics San Juan Capistrano
1-2 mL Blood
Red Top (No Additive)
Plasma collected in EDTA (lavender-top) or sodium heparin (green-top) tube is also acceptable.
Room Temp: 7 Days; Refrigerated: 7 Days; Frozen: 30 Days
Unseparated serum (>48 hrs on clot); Serum in Serum Separator Tube (SST) not separated from the gel within 24 hours
0.5 mL Serum or Plasma
0.3 mL Serum or Plasma
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.