Test Directory
4227 T4 (Thyroxine), Total
Specimen Type
Specimen Stability
Reference Range
Serum-SST
7 days 2-8° C
4.5-12.6 ug/dL
Specimen Requirements
Preferred amount: 1.0 mL Serum
Minimum amount: 0.5 mL Serum
Minimum amount: 0.5 mL Serum
Method
Immunochemiluminometric
Schedule
Mon-Sat
Turn-Around Time
24hrs; Also offered STAT at an additional charge
Instructions/Notes
Centrifuge required?: Yes
Clinical Utility
To help evaluate thyroid gland function; to help diagnose hypothyroidism or hyperthyroidism; to screen for hypothyroidism in newborns.
CPT Codes
84436
