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HelpTest Code 4011250 Free T4 (FT4)
Specimen Requirements
1.0 mL serum or heparinized plasma
NOTE: Serum/plasma should be separated from
cells within 2 hours of collection.
Container
PST (light green top) tube or SST (tiger, gold, or red top) tube
Minimum Volume
70 µL serum/plasma
Stability
24 hours at room tempature, 14 days at 2-8°C in a sealed
container
May be frozen at -20°C for 3 months
Analytical Time
Same day
Sample Retention Time
7 days
Method
Chemiluminescent Immunoassay
CPT Code
84439
Performing Laboratory
Springfield Hospital Laboratory
Reject Due To
Improperly labeled sample