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T3, Free

Source Blood
Mnemonic 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 Micro-Collections using Microtainers

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

Male/Female

Units

1-365 days

4.2-7.3

pmol/L

1-15 years

3.8-6.7

pmol/L

16-150 years

2.7-5.7

pmol/L