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RVST3 / 070104L
TRIIODOTHYRONINE REVERSE

Test Code RVST3 / 070104L 
Test TRIIODOTHYRONINE REVERSE 
Methodology Liquid chromatography/tandem mass spectrometry (LC/MS-MS) 
Description Useful for:
Reverse T3 (rT3) has limited application. 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. 
Specimen Draw blood in either a plain red-top tube or serum gel tube. Spin down and send 1.0 mL (minimum 0.6 mL) of serum in a plastic transfer tube. 
Reference Values Age____________________Range (ng/dL)

Premature (26-31w)__________33.0-147.0

Premature (32 - 35w)_________49.0-217.0

Full Term ( 2-7d)_____________33.0-206.0

8d -5m____________________13.0-107.0

6m-12m____________________8.1-52.8

1-15y______________________8.3-22.9

16y and older________________9.2-24.1 
Analytic Time 3 Day 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 84482