Recommendations when to order or not order the test. May include related or preferred tests.
Unique test identifier.
Process(es) used to perform the test.
Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Days of the week the test is performed.
Expected turnaround time for a result, beginning when ARUP has received the specimen.
New York DOH Approval Status
Indicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
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)
Grossly hemolyzed specimens.
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Triiodothyronine, Reverse - LC-MS/MS
18 years and older
Triiodothyronine, Total - LC-MS/MS
20 years and older
Triiodothyronine, Ratio (T3:RT3)
18 years and older
Background information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
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)
Additional information related to the test.
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* 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.
Other names that describe the test. Synonyms.
T3 total and reverse
Total and reversed Triiodothyronine T3 total and reverse
Triiodothyronine, Total and Triiodothyronine, Reverse with Ratio Calculation by Tandem Mass Spectrometry