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Test Code LAB4198 T3, FREE (Free Triiodothyronine )

Important Note

Use same specimen type for serial measurements.

Specimen Type

Preferred Sample: Lithium Heparin Plasma (Mint Green Top)
Alternative Sample: Serum (SST, Gold, Tiger, Red Top Tube)

Specimen Volume

1 mL

Minimum Volume

0.5 mL

Microtainer - 0.2 mL

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Refrigerated: 6 days
 

Method

Chemiluminescent microparticle immunoassay (CMIA)

Reference Ranges

Age Female Male
4 days to 1 year 2.32-4.87 pg/mL 2.32-4.87 pg/mL
    1 year to 12 years     2.79-4.42 pg/mL     2.79-4.42 pg/mL
12 years up to 15 years 2.50-3.95 pg/mL 2.89-4.33 pg/mL
15 years up to 19 years 2.31-3.71 pg/mL 2.25-3.85 pg/mL
> 19 years 1.58-3.91 pg/mL 1.58-3.91 pg/mL

 

Reporting Limit

Measuring Range: 1.5-20.0 pg/dL

Reporting Range: 1.5-20.0

Synonyms

FT3; Free Triiodothyronine; Triiodothyronine, Free T3; T-3 Free, Unbound, Thyroid, T3F, FT3KH, LAB4198

CPT Codes

84481