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Test Code T4 T4 (Thyroxine), Serum

Additional Codes

Sunrise Clinical Manager (SCM) Orderable:  T4, Serum 

AllScripts (AEHR) Orderable:  T4, Serum

Performing Laboratory

Northwell Health Laboratories


Electrochemiluminescence Immunoassay (ECLIA)

Reference Values

Pediatrics: See report.

Adults: 4.6-12.0 µg/dL

Test Classification and CPT Coding


Specimen Required

Container/Tube: Gold-top tube(s)

Specimen: 1 mL of serum

Transport Temperature: Refrigerate

Stability: 4 Days Room Temperature

                 8 Days Refrigerated

                 1 Year Frozen


Day(s) and Time(s) Performed

Monday through Sunday, Continuously

Computer Interface Code

PDM # 5300425