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Test Code FT4 T4 (Thyroxine), Free, Serum

Additional Codes

Sunrise Clinical Manager (SCM) Orderable:   Free Thyroxine, Serum

AllScripts (AEHR) Orderable:  Free T4

Performing Laboratory

Northwell Health Laboratories


Electrochemiluminescence Immunoassay (ECLIA)

Specimen Requirements

Container/Tube: Gold-top tube(s)

Specimen: 1 mL of serum

Transport Temperature: Refrigerate

Stability:  5 Days Room Temperature

                 7 Days  Refrigerated

               30 Days  Frozen

Reference Values

0.9-1.8 ng/dL

Test Classification and CPT Coding


Day(s) and Time(s) Performed

Monday through Sunday, Continuously

Computer Interface Code

PDM # 5300445