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T4 (Thyroxine), Free, Plasma or Serum
Test Code1212
CPT Codes
84439
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Note: 1. Indicate serum. 2. Label specimen appropriately (serum).
Minimum Volume
Pediatric volume: 0.3 mL
Transport Temperature
Refrigerate
Methodology
Immunoassay
Setup Schedule
Monday through Sunday
Reference Range
0.70-1.80 ng/dL
Clinical Significance
Useful for evaluation of thyroid status.
Performed By
CoxHealth