Reverse Triiodothyronine (rT3) Build info

Synonyms

• T3, REVERSE
• T3R
• TRIIODOTHYRONINE, REVERSE (T3REV)
• TRI-IODOTHYRONINE
• LAB138

Short Name

T3 REVERSE

Procedure Master Number

LAB138

Procedure ID

924

Clinical Info

Reverse triiodothyronine (rT3) is an isomer of triiodothyronine (T3) with no demonstrated biological activity.1,2 The majority of rT3 is produced through peripheral enzymatic monodeiodination of T4 at the 5 position of the inner ring of the iodothyronine nucleus of thyroxine (T4). A lesser amount of rT3 is secreted directly by the thyroid gland. Reverse T3 is biologically inactive and does not stimulate thyroid hormone receptors.

Specimen Type

Blood

Container

Gold Top Tube

Collection Instructions

Container/Tube: Gold Top Tube(s)
Specimen: 1.2 mL serum (0.8 mL min)
Transport Temperature: Refrigerate

Transport Instructions

Refrigerate

Specimen Stability

Methodology

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Days Performed

Tuesday - Saturday
 
TAT 2 - 3 Days

Performing Laboratory

LabCorp Burlington

CPT

84482
 
LOINC - 3052-8

PDM

5902690

Results