Specimen Requirements
Title
T3, Reverse
Specimen Requirement
Collect red top/1.0 mL serum and send.
Do not collect SST.
Methodology
Liquid Chromatography/Tandem Mass Spectrometry
Stability
Refrigerated: 7 days, Frozen: 3 months
Reference Range
The reference range is determined by the performing laboratory and will show on the report.
Turnaround
2-5 days performed Monday, Wednesday, Thursday
Clinical Use
Reverse T3 measurement may be useful in evaluating the euthyroid sick patient with low T3 concentrations. Also useful in evaluating thyroid function and metabolism. Not to be confused with tri-iodothyronine.
Test Code
RT3W