List All Test Names Beginning With:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Microbiology Sources | Microbiology Tests | Anatomic Pathology | Cytopathology

T4, Free

Source Blood
Mnemonic FT4
Specimen Requirements

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

0.2 mL heparinized 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 T4; Thyroxine, Free
Reference Interval 10.0 - 25.0 pmol/L