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Triiodothyronine, Reverse by Tandem Mass Spectrometry
2007918
Ordering Recommendation

Generally not recommended for routine evaluation of thyroid disorders, although may be considered in pregnant women.

Mnemonic
RT3 TMS
Methodology
Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Performed
Sun-Sat
Reported
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
 
Collect
Plain red or serum separator tube. Also acceptable: Lavender (EDTA) or pink (K2EDTA).  
Specimen Preparation
Allow serum specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within two hours of collection. Transfer 2 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 1 mL)  
Storage/Transport Temperature
Frozen.  
Unacceptable Conditions
Grossly hemolyzed specimens  
Remarks
 
Stability
Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months  
Reference Interval
Age
Reference Interval
0 -17 yearsNot established
18 years and older9.0 - 27.0 ng/dl

Interpretive Data


Compliance Statement B: This test was developed and its performance characteristics determined by ARUP Laboratories. The U.S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.
Note
CPT Code(s)
84482
Components
Component Test Code*Component Chart NameLOINC
2007919Triiodothyronine, Reverse - LC-MS/MS3052-8
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • Reverse T3
  • Reverse T3, Serum
  • Reverse Triiodothyronine
  • RT3
  • T3