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Triiodothyronine, Total and Triiodothyronine, Reverse with Ratio Calculation by Tandem Mass Spectrometry
2008406
Ordering Recommendation
Mnemonic
T3RT3RATIO
Methodology
Quantitative Liquid Chromatography/Tandem Mass Spectrometry
Performed
Mon-Sun
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
Serum separator tube or plain red. 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
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months 
Reference Interval
Available Separately
Component
Age
Reference Interval
Yes (2007918)Triiodothyronine, Reverse by Tandem Mass Spectrometry0-17 years
18 years and older
Not Established
9.0-27.0 ng/dL
NoTriiodothyronine, Total - LC-MS/MSCord blood
0-3 days
4-30 days
1-23 months
2-6 years
7-11 years
12-19 years
20 years and older
14-86 ng/dL
96-292 ng/dL
62-243 ng/dL
81-281 ng/dL
83-252 ng/dL
92-219 ng/dL
83-215 ng/dL
80-200 ng/dL
NoTriiodothyronine, Ratio (T3:RT3)0-17 years
18 years and older
Not Established
4.2-11.0

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)
84480; 84482
Components
Component Test Code*Component Chart NameLOINC
2007919Triiodothyronine, Reverse - LC-MS/MS3052-8
2008407Triiodothyronine, Total - LC-MS/MS
2008408Triiodothyronine, Ratio (T3:RT3)
* 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
  • T3 total and reverse
  • Total and reversed Triiodothyronine T3 total and reverse