T3, Free
Mnemonic: LAB137
CPT Code: 84481
Synonym
Free T3; T3, Free; T3, Free, Serum; Triiodothyronine, Free; Unbound T3
Order Alias 2
T3F
Specimen Type
Serum
Specimen Container
Gold SST; Red Plain tube
Specimen Handling
If a red-top tube is used, transfer separated serum to a plastic transport tube. Separate Serum from cells within 2 hours of collection and transfer to a standard transport tube.
Unacceptable Conditions
Lipemic specimens
Temperature
Refrigerated
Methodology
Competative Immunoassay
Volume
0.8 mL
Minimum Volume
0.35 mL
Schedule
Daily
Additional Information
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for
Stability
Temp: 8 hours; Refrigerated: 48 hours
Reference Range Information
2.3 - 4.2 pg/mL
Test Includes
FT3
Place of Service
St. Michael Medical Center
Department
SMMC Chemistry
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