Test Catalog

Test ID: RT3    
T3 (Triiodothyronine), Reverse, Serum

Method Description Describes how the test is performed and provides a method-specific reference

Reverse triiodothyronine-13C (rT3-13C) is added to serum or plasma samples as an internal standard. Reverse T3 (rT3) and rT3-13C are dissociated with a protein precipitation and then extracted from the specimens using a solid-phase cartridge. The eluate is dried down under nitrogen, reconstituted with mobile phase and analyzed by liquid chromatography-tandem mass spectrometry using multiple reactions monitoring in the positive mode.(Zhang Y, Conrad AH, Conrad GW: Detection and quantification of 3, 5, 3'-triiodothyronine and 3, 3', 5'-triiodothyronine by electrospray ionization tandem mass spectrometry. J Am Soc Mass Spectrom 2005 Nov;16[11]:1781-1786)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Wednesday, Friday

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

2 days

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Clinic Laboratories until the release of the test result

6 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

14 days

Performing Laboratory Location Indicates the location of the laboratory that performs the test