CPT Code(s)

84482

Methodology

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Reference Range(s)

8-25 ng/dL

Clinical Significance

The assay may be useful in the diagnosis of nonthyroidal illness (NTI). Patients with NTI have low T3 concentrations and increased concentrations of rT3. RT3 may be useful in neonates to distinguish euthyroid sick syndrome from central hypothyroidism.

Alternative Name(s)

RT3,Triiodothyronine Reverse,rT3 ,Reverse Triiodothyronine,Reverse T3