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Order Code FT4 T4 (Thyroxine), Free, Plasma or Serum

Specimen Requirements

Collection Container/Tube:

Preferred: Green-top (lithium heparin) gel tube.

Acceptable: Plain, red-top tube or a serum gel tube

Specimen Volume: 2 mL

Pediatric (minimum) volume: 0.5 mL in a green top (lithium heparin) MICROTAINER gel tube

Performing Laboratory

Ridgeview Medical Center Laboratory

Sibley Medical Center

Day(s) Test Set Up

Monday through Sunday

Methodology

Chemiluminescence

Reference Values

0.76-1.46 ng/dL

Test Classification and CPT Coding

84439

Specimen Transport Temperature

 

Specimen Type Temperature Time
Serum/plasma Ambient 1 day
  Refrigerated (preferred) 5 days
  Frozen 5 days