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HelpTest Code LAB127 Thyroxine, Free (FT4)
Specimen Requirement
1.0 mL serum or Lithium Heparin; SST and PST acceptable.
Avoid prolonged contact with red blood cells.
Specimen Stability
6 days at 2-8° C
6 days at -20° C
Testing Schedule
Daily
Reference Range
0.7 - 1.8 ng/dL
Testing Department
Chemistry
Method
Chemiluminescent Microparticle Immunoassay (CMIA)
CPT Code
84439
Additional Testing Locations
This test is also performed daily at the following Altru Clinics:
- Crookston
- Devils Lake
Please contact appropriate lab location for specific test information, as methodology varies by site.
Outpatient Turnaround Time
24 hours after receipt
Inpatient STAT Turnaround Time
Not Applicable
Inpatient Routine Turnaround Time
4 hours after receipt