T4, FREE (includes T4) (Esoterix)

Synonyms: Free Thyroxine
Computer Code: (RTFT4)
Specimen Collection: 4 mL blood (red or gold top tube).
Minimum Volume: 1 mL
Handling Instructions for Offsite Areas: Allow to clot, centrifuge, remove serum, freeze. Min .4 mL serum. Separate serum from cells within 45 minutes of collection.
Reference Values: See reference laboratory report.
Lab Code: Send Out
Requisition: SPEC C
Test Frequency: NA
Routine TAT: 10 days
Stat TAT: N/A
CPT Code(s): 84436, 84439
Methodology Used:
See Addendum XVII