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Test Mnemonic FT4/T4F T4 (Thyroxine), Free, Serum

Methodology

Clinical Significance:

Evaluation of thyroid function independent of binding protein status.

Performing Laboratory

Hallmark Health

Physician Office Specimen Requirements

Container/Tube:  Serum gel tube(s)

Specimen:  0.5 mL of serum

Transport Temperature:  Refrigerate

Reference Values

0.9-1.7 ng/dL