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HelpTest Code LAB1916 T4 Free
Aliases
FT4
T4F
Free Thyroxine
Performing Section
Chemistry
Purpose/Principle
For the quantitative determination of Free Thyroxine (FT4) in serum and plasma
Special Collection Notes
Collect specimen according to standard operating procedure.
Specimen Type
Serum/Plasma:
Gold Top Tube-SST (Preferred)
Red Top Tube-Plain
Specimen Volume
Preferred: 1.5 mL
Minimum: 0.6 mL (0.3 mL Serum/Plasma)
Processing Instructions
Allow sample to clot in upright position for 30 minutes.
CENTRIFUGE sample per procedure.
Store and send sample refrigerated via courier.
Temperature
Refrigerated
TAT
Routine: 120 Minutes
STAT: 60 Minutes
Test Components
Free T4 (Free Thyroxine)
CPT
84439
Sample Stability
Ambient: Not recommended
Refrigerated: 6 days
Test/Batch Schedule
Runs daily-on demand
Method
Chemiluminescent microparticle immunoassay (CMIA)
Reference Range
0 up to 3 Days: 2.00-5.00 ng/dL
3 Days up to 1 Month: 0.90-2.20 ng/dL
1 Month up to 19 Years: 0.80-2.00 ng/dL
19 Years and up: 0.78-2.19 ng/dL