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Laboratory Test Directory

Triiodothyronine (T3), Free

Components

Name Method Department Units
Free T3 Chemiluminescence
Chemiluminescent Microparticle Immunoassay (CMIA)
Core Lab, Endocrinology pg/mL

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), No Gel

3 mL 3 mL
Alternate

Green tube (Lithium heparin), with Gel

3 mL 3 mL
Alternate

Gold tube, (SST) with Gel

3.5 mL 3.5 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 3 mL
Alternate

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Red tube, (no anticoagulant), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.6 mL
Stability

Room temperature - 4 hour(s)
Refrigerated - 24 hour(s)

Specimen Preparation

  • Allow to clot completely at room temperature
  • Transport to laboratory as soon as possible
  • If delay in transport is greater than 4 hours, refrigerate

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume
Preferred

Green tube (Lithium heparin), No Gel

3 mL 2 mL
Alternate

Green tube (Lithium heparin), with Gel

3 mL 2 mL
Alternate

Gold tube, (SST) with Gel

3.5 mL 2 mL
Alternate

Red tube, (no anticoagulant), No Gel

3 mL 2 mL
Alternate

Green tube (Lithium heparin), No Gel

Micro sample tube 1 mL
Alternate

Red tube, (no anticoagulant), No Gel

Micro sample tube 1 mL
Alternate

Green tube (Lithium heparin), with Gel

Micro sample tube 0.6 mL
Stability

Room temperature - 4 hour(s)
Refrigerated - 6 day(s)
Frozen - 6 day(s)

Specimen Preparation

  • Allow to clot completely at room temperature
  • Centrifuge, remove plasma and refrigerate
  • Transport to laboratory as soon as possible
  • If delay in transport is greater than 4 hours, refrigerate

Reasons for Rejection

  • Wrong collection tube
  • Gross hemolysis
  • Gross icterus
  • Gross lipemia
  • Wrong type of specimen

CPT Code

  • 84481