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Free T4
Test CodeIT4F
Alias/See Also
FT4
CPT Codes
84439
Preferred Specimen
0.6 ml of whole blood (0.3 mL serum)
Minimum Volume
Minimum: 0.2 mL of whole blood (0.1 mL of serum/)
Transport Container
Serum Separator (gold top)
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature: 8 hours
Refrigerated: 7 days
Frozen: 4 weeks at -20 degrees C
Refrigerated: 7 days
Frozen: 4 weeks at -20 degrees C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Turbidity
Methodology
Competitive Immunoassay
Setup Schedule
Daily
Report Available
Inpatient turn-around time: stat 2 hours, routine 4 hours. Outpatient specimens received by noon will be reported by 4:30. Specimens received after noon will be reported by the next morning.
