Triiodothyronine, Total and Triiodothyronine, Reverse with Ratio Calculation by Tandem Mass Spectrometry
Ordering Recommendation
Mnemonic
Methodology
Quantitative Liquid Chromatography/Tandem Mass Spectrometry
Performed
Mon-Sun
Reported
1-4 days
New York DOH Approval Status
Specimen Required
Serum separator tube or plain red. Also acceptable: Lavender (EDTA) or pink (K2EDTA).
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)
Frozen.
Grossly hemolyzed specimens.
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 Spectrometry | 0-17 years 18 years and older |
Not Established 9.0-27.0 ng/dL |
No | Triiodothyronine, Total - LC-MS/MS | Cord 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 |
No | Triiodothyronine, Ratio (T3:RT3) | 0-17 years 18 years and older |
Not Established 4.2-11.0 |
Interpretive Data
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
Hotline History
CPT Codes
84480; 84482
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
2007919 | Triiodothyronine, Reverse - LC-MS/MS | 3052-8 |
2008407 | Triiodothyronine, Total - LC-MS/MS | 3053-6 |
2008408 | Triiodothyronine, Ratio (T3:RT3) | 57899-7 |
Aliases
- T3 total and reverse
- Total and reversed Triiodothyronine T3 total and reverse