4 - 6 days
Reverse T3 (Triiodothyronine)
T3 (Triiodothyronine), Reverse
Reverse T3, S
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Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
In hospitalized or sick patients with low triiodothyronine (T3) values, elevated reverse triiodothyronine (rT3) values are consistent with "sick euthyroid" syndrome. Also, the finding on an elevated rT3 level in a critically ill patient helps exclude a diagnosis of hypothyroidism.
9 - 27.0 ng/dL
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect specimen in a red top tube.Send to Specimen Processing in a green bag. Specimen must be spun and aliquotted within 2 hours of collection.
Collect specimen in a red top tube. Centrifuge, aliquot serum into a plastic vial within 2 hours of collection, and refrigerate.