Specimen Collection Manual and Test Catalog
T3, FREE, TRACER DIALYSIS
Geisinger Epic Procedure Code: LAB3124 Geisinger Epic ID: 31992SPECIMEN COLLECTION
Specimen type:
Serum
Preferred collection container:
Alternate collection container:
6 mL red-top (plain, non-serum separator) tube
Specimen required:
1 mL aliquot of serum; minimum 0.5 mL.
SPECIMEN PROCESSING
Processing instructions:
Centrifuge and transfer serum specimens to clean, plastic, screw-capped vial(s).
Transport temperature:
Room temperature.
Specimen stability:
Room temperature: 4 days. Refrigerated: 7 days. Frozen: 28 days.
TEST DETAILS
CPT code(s):
84481, 84480
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.
The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Methodology:
Equilibrium Dialysis by Radioimmunoassay (RIA)
Immunochemiluminescence Assay
Immunochemiluminescence Assay
Synonyms:
Triiodothyronine, Free T3, equilibrium, Quest test code 36598, FT3DT
Clinical significance:
Review Date:
11/21/2024 T3, Free, Tracer Dialysis - T3 measurements are used to diagnose hyperthyroidism. This test can also be used to clarify thyroid status in the presence of possible protein-binding abnormalities.
Performing Locations