Free T4 (Thyroxine) by Equilibrium Dialysis
This test is subject to pathology approval prior to sending to the reference laboratory for testing., ARUP #93244, Order as a Miscellaneous Sendout.
This test is only available to Endocrinologists and Nuclear Medicine Physicians.
Specimen Collection Criteria
Collect (preferred specimen): One Gold-top SST tube.
Also acceptable: one Red top tube.
Physician Office/Drawsite Specimen Preparation
Centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).
Preparation for Courier Transport
Transport: 2.0 mL serum, refrigerated (2-8°C or 36-46°F). (Min: 0.3 mL)
- Specimens not collected and processed as indicated.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 4 days
Refrigerated (2-8°C or 36-46°F): 2 weeks
Frozen (-20°C/-4°F or below): 1 month
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.
Sent to ARUP Laboratories, Salt Lake City, UT.
Sunday, Tuesday, Thursday.
Results available in 2-7 days.
High Performance Liquid Chromatography-Tandem Mass Spectrometry.
ARUP #93244, Order as a Miscellaneous Sendout.
Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.
This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills,
Grosse Pointe, Royal Oak, and Troy campuses.