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Laboratory Test Directory

Triiodothyronine, Reverse by Tandem Mass Spectrometry

Components

Name Method Department Units
T3, Reverse Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Send Out ng/dL

Specimen Requirements

Serum Spun, Plasma Spun

Container Type Container Size Specimen Volume
Preferred

Red tube, (no anticoagulant), No Gel

6 mL 2 mL
Alternate

Gold tube, (SST) with Gel

6 mL 2 mL
Alternate

Red Tube (no anticoagulant) with Gel

6 mL 2 mL
Alternate

Purple tube (EDTA)

6 mL 2 mL
Stability

Room temperature - 24 hour(s)
Refrigerated - 1 week(s)
Frozen - 3 month(s)

Specimen Preparation

  • Centrifuge within 2 hours, separate supernatant and freeze
  • Transport to laboratory as soon as possible

Reasons for Rejection

  • Wrong collection tube
  • Not frozen within specified time frame
  • Gross hemolysis

Comments

NOTE: This is not the same test as Triiodothyronine (T3), or T3 Uptake.

CPT Code

  • 84482