Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Test Name: Sunquest Test Code Epic Procedure Code Or ID CPT Code:  


Sunquest Test Code:
T3R      Geisinger Epic Procedure Code: 84482.01         Geisinger Epic ID: 17562

Specimen type:
Serum (preferred) or plasma.
Preferred collection container:
Alternate Collection Container:
3 mL lavender-top (K2 EDTA) tube
3 mL green/black top lithium heparin tube
Specimen required:
0.5 mL aliquot of serum or plasma; minimum 0.3 mL.
Special notes:
Please submit a separate frozen aliquot. Do not submit gel tube. See Specimen Processing Instructions.

Specimen processing instructions:
Must spin and separate from cells immediately. Centrifuge and transfer serum or plasma specimens to clean, plastic, screw-capped vial(s). 
Transport temperature:
Frozen (preferred).
Specimen stability:
Room Temperature: 7 days. Refrigerated: 7 days. Frozen: 30 days.
Rejection criteria:
Stability limits exceeded. Serum submitted still in gel tube.

Reference interval:
8-25 ng/dL
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Reverse T3 (rT3).
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
T3, Triiodothyronine, Reverse
Quest test code 90963
Clinical significance:
The assay may be useful in the diagnosis of nonthyroidal illness (NTI). Patients with NTI have low T3 concentrations and increased concentrations of rT3. RT3 may be useful in neonates to distinguish euthyroid sick syndrome from central hypothyroidism.

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Monday-Friday morning    
Performed stat? No
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