rT3 - Total, Serum/Plasma Test (7668SP)

rT3 - Total, Serum/Plasma Test (7668SP)

Analysis Code 7668SP 
Test Name rT3 - Total, Serum/Plasma 
Test Includes rT3 - Total 
Compound Synonym(s) 3,3',5'-Triiodo-L-thyronine; Reverse T3 
Purpose Endocrinology; This test is New York State approved. 
Category Thyroid Hormone 
Method(s) High Performance Liquid Chromatography/
TandemMass Spectrometry (LC-MS/MS) 
Specimen Requirements 1 mL Serum or Plasma 
Transport Temperature Refrigerated 
Specimen Container Green top tube (Sodium Heparin), Polymer gel separation tube (SST or PST), Red top tube (no additive) 
Special Handling Promptly centrifuge and separate Serum or Plasma into a plastic screw capped vial using approved guidelines. 
Light Protection Required Not Required 
Stability Room Temperature: 15 day(s)
Refrigerated: 23 day(s)
Frozen (-20 °C): 23 day(s) 
*Rejection Criteria None 
Day(s) Test Set-up / TAT [LC-MS/MS] Tuesday-Saturday 2nd Shift / 1 day 
Suggested CPT Code 84482 
**Minimum Volume 0.25 mL 
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You are viewing rT3 - Total, Serum/Plasma Test (7668SP)
*Rejection criteria pertain to clinical specimen submissions only.
**Stated minimum volume allows for a single analysis. Repeat analysis will not be performed.


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