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HelpTest Code LAB1916 T4 Free
Aliases
FT4
T4F
Free Thyroxine
Purpose/Principle
For the quantitative determination of Free Thyroxine (FT4) in serum and plasma
Performing Section
Chemistry
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)
Special Collection Notes
Collect specimen according to standard operating procedure.
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
Sample Stability
Ambient: Not recommended
Refrigerated: 6 days
TAT
Routine: 120 Minutes
STAT: 60 Minutes
Test/Batch Schedule
Runs daily-on demand
Method
Chemiluminescent microparticle immunoassay (CMIA)
Test Components
Free T4 (Free Thyroxine)
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
CPT
84439