Collection Notes: Grossly lipemic or grossly hemolyzed specimens are not acceptable. Please collect a designated SST tube for this test. The SST tube for this test code cannot be shared with other testing.
Clinical Utility: An increased production of rT3 is often seen in patients with disorders such as chronic fatigue syndrome (CFS), fibromyalgia, Wilson's Thyroid Syndrome and stress. Measurement of rT3 is also valuable in identifying sick euthyroid syndrome where active T3 is within normal range and rT3 is elevated.
Serum (1 mL)
Ambient 7 Days
Refrigerated 30 Days
Frozen 1 Year
Plasma (1 mL), Na heparin
Ambient 7 Days
Refrigerated 30 Days
Frozen 1 Year
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