abcdefghijklmn
opqrstuvwxyz
Test Menu
Test Change Details
Allergy & Immunology
Cardiology & Coagulation
Dermatopathology
Endocrinology
Gastroenterology
Genetics
Hepatology
Infectious Disease
Microbiology
Nephrology
Neurology
Oncology
Pathology
Pediatrics
Rheumatology
Toxicology
Urology
Women's Health
90963: T3, Reverse, LC/MS/MS Print View
T3, Reverse, LC/MS/MS LC/MS-MS  8 - 25  ng/dL 

PRIMARY
1 Serum 0.5 (0.3) mL   Frozen - 30 Day(s)/Refrigerated - 7 Day(s)/Room Temperature - 7 Day(s)  
ALTERNATE
  Plasma Heparinized 0.5 (0.3) mL   Frozen - 30 Day(s)/Refrigerated - 7 Day(s)/Room Temperature - 7 Day(s)  
  Plasma EDTA 0.5 (0.3) mL   Frozen - 30 Day(s)/Room Temperature - 7 Day(s)/Refrigerated - 7 Day(s)  

3,3',5'-Triiodothyronine (reverse T3, rT3) is, along with 3,3,5'-Triiodothyronine (T3) a deiodinated metabolite of thyroxine (T4), the major secretory product of the thyroid gland and is secreted into the bloodstream. Unlike T3, however, rT3 is thought to be metabolically inert. The process of 5'- monodeiodination that converts T4 to T3, and rT3 to diiodothyronine (DIT) is inhibited in a wide variety of conditions, collectively referred to as nonthyroidal illnesses (NTI) or the 'euthyroid sick' state. These conditions include fasting, malnutrition, poorly controlled diabetes mellitus, trauma, surgery, and systemic illness. Consequently, in patients with NTI the serum T3 level typically decreases, and the rT3 often, but not always, increases.

Allow blood to clot at room temperature for 30 minutes. Centrifuge
and separate the serum from cells immediately. Alternatively,
collect blood in a serum separator tube (SST), allow to clot at room
temperature, centrifuge, and remove from gel within 24 hours.
Setup Schedule
Tuesday-Saturday

Reported (Analytical Time)
3 days

CPT Code
84482

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Methodology: Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) Assay Category: Laboratory Developed Test Reject Criteria: Unseparated serum (>48 hours on clot); serum in serum separator tube not separated from the gel within 24 hours






1996 - 2017 Quest Diagnostics Nichols Institute of Valencia
For test information, please call Client Services at 800-421-4449.

San Francisco Web Design & Database