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HelpTest Code FT4 T4 Free, Serum/Plasma
Specimen Volume
1.0 mL
Preferred Specimen
Gold (SST) (Serum)
Alternate Specimen
Green Gel (GGT)
Specimen Handling Instructions
Green-top tube (Plasma – GGT) also acceptable. Specimens are stable for 5 days
Transport
Routine courier pick-up
Cutoff Time
None
Department
ChemistryMethodology
Chemiluminescence
Stat Turn-around Time
N/A
Routine Turn-around Time
1 DayReference Ranges
0.9-1.8 ng/dL