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Test Code T4 T4 (Thyroxine), Total

Performing Laboratory

Greenbrier Valley Laboratory 304-647-6060
Memorial Hospital Laboratory- Automated Procedures  304-388-5953       
Plateau Medical Center Laboratory 304-469-8621
Teays Valley Hospital Laboratory 304-757-1770

Specimen Requirements

Memorial, Plateau, and Teays

Plasma- Mint Green, Dark Green Lithium Heparin or Serum- SST gold top, red top

Allow SST or red top to completely clot

Spin and physically separate plasma/serum from contact with cells as soon as possible

4 mL of plasma/serum (minimum 2 mL)

 

Additional specimen type that can be used ONLY at Greenbrier

EDTA

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient

Additional rejections ONLY at Greenbrier

  • Turbid
  • Hemolyzed

Storage and Stability

Memorial, Plateau, and  Teays

Room temperature 15-30oC 8 hrs
Refrigerated 2-8oC 48 hrs
Frozen <-20oC Not specified

 

Greenbrier

Refrigerated 2-8oC                                      5 days
Frozen <-20oC            4 weeks

 Avoid repeat freeze thaw cycles

Reference Values

Memorial,  Plateau, Teays 6.09-12.23 mcg/dL
Greenbrier 6.9-12.23 ug/dL

Methodology

Memorial , Plateau, Teays         Chemiluminescent  immunoenzymatic competitive assay        
Greenbrier    Competitive immunoassay

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

84436