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T3, Free
Test CodeFT3
Alias/See Also
Free Triiodothyronine
CPT Codes
84481
Preferred Specimen
1.0 mL of serum (2.0 mL of whole blood)
Minimum Volume
0.5 mL of serum (1.0 mL of whole blood)
Instructions
Separate from cellular material within 4 hours of collection.
Transport Container
Serum Separator (gold top)
Transport Temperature
Refrigerated
Specimen Stability
Room Temperature: 3 hours
Refrigerated: 4 days
Frozen: 1 month
Refrigerated: 4 days
Frozen: 1 month
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross lipemia and hemolysis
Methodology
Chemiluminescent Immunoassay
Setup Schedule
Monday through Saturday
Report Available
Report available in 24 hours
Clinical Significance
Used for identification of thyrotoxicosis. FT3 can be useful to identify patients with subclinical hyperthyroidism who have suppressed serum TSH and normal FT4 and FT3.
