Thyroxine (T4), Free

Free T4, T4, Free
TEST CODE
300265
CPT
84439
Expected
Turnaround Time
Within 1 Day
Patient Preparation
Patient should refrain from consuming biotin at least 48 hours prior to sample collection.
Lab Charge
$22.55

Specimen Requirements

Specimen
Serum
Volume
1.0 mL / 0.5 mL minimum
Container
SST (preferred) or Red Top Tube
Preparation
Draw blood in gel-barrier tube and centrifuge. If red top is used, remove the serum and place in a transport tube. Label the transport tube with patient identifiers and specimen type.
Stability
Refrigerated, 2 Days
Storage Instructions
Refrigerated

Test Details

Methodology
Rejection Criteria
Received after 2 days refrigerated. Serum not separated from cells. Sample hemolyzed. Grossly lipemic samples. Improper labeling. Incorrect collection container.

Test Components

Test Code
Test Name
LOINC
300265
Thyroxine (T4), Free
3024-7

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