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T3, Free

Source Blood
Mnemonic FT3
If only T3 is indicated on the requisition, order Free T3 (FT3).
Specimen Requirements

1 x 3 mL or 4.5 mL light green (mint) top PST tube. Gold top SST tube also acceptable. 

0.5 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections

Collection can be combined in one 5 mL PST or SST tube with other thyroid tests.
Specimen Handling
Additional Information
Testing Location Chemistry-DSC
Testing Frequency Daily
Alternate Name(s) Free T3
Reference Interval
 Age   Reference Interval
 4 days - 30 days  3.0 - 8.1 pmol/L
 31 days - 1 year  2.4 - 9.8 pmol/L
 2 years - 6 years  3.0 - 9.1 pmol/L
 7 years - 11 years  4.1 - 7.9 pmol/L
 12 years - 17 years  3.5 - 7.7 pmol/L
 18 years - 150 years  3.5 - 6.5 pmol/L