Alberta Precision Laboratories

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Organization:

Alberta Precision Laboratories

Message Alert:

PLEASE NOTE: This Test Directory is in an interim state and due to changes pertaining to the DynaLIFE transition, performing site for routing has not been updated. Please refer to Laboratory Information System for appropriate routing.

Test Name/Synonym:

Free T4 - Calgary Zone (CLS)

Test Code:

FT4
IF ONLY T4 IS INDICATED ON THE REQUISITION, ORDER FREE T4 (FT4).

Primary Container:

Lithium Heparin PST Gel (Light Green)

Alternate Containers:

SST (GOLD)

Specimen Collection Requirements:

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

0.5 mL plasma or serum

Collection can be combined in one 5 mL PST or SST tube with other thyroid tests.

Test Resources:

Biotin Interference
Calgary Zone: Microcollection Minimum Whole Blood Volumes

Testing Schedule:

Test performed on a daily basis.

Reference Interval:

FT4 Reference Intervals

Age	Gender	(pmol/L)
0 up to less than 15 days	All	13.5 – 50.0
15 days up to less than 30 days	All	8.7 – 32.5
30 days or greater	All	10.0 – 25.0

Testing Area:

Chemistry

Performing Site:

Diagnostic and Scientific Centre

Additional Test Information:

If FT4 test has been ordered with additional wording such as "equilibrium" or "dialysis", see T4 (Thyroxine), Free by Equilibrium Dialysis (FT4D).

Last Updated On:

Wednesday, June 22, 2022