Specimen Collection Manual and Test Catalog
T3, TOTAL
Geisinger Epic Procedure Code: LAB3126 Geisinger Epic ID: 21990SPECIMEN COLLECTION
Specimen type:
Plasma or serum
Preferred collection container:
Specimen required:
1 mL aliquot of plasma or serum; minimum 0.5 mL.
SPECIMEN PROCESSING
Processing instructions:
Allow serum to clot. Centrifuge to separate serum or plasma within 2 hours of collection.
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Refrigerated: 7 days. Frozen: 1 month.
Rejection criteria:
Stability limits exceeded.
TEST DETAILS
Reference interval:
CPT code(s):
84480 Total T3 = 80-200 ng/dL.
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.
Test includes:
Total T3.
Methodology:
Electrochemiluminescence
Synonyms:
TOTT3G, Total Triiodothyronine
Clinical significance:
Total T3 measurements are used to diagnose and monitor treatment of hyperthyroidism and are essential for recognizing T3 toxicosis.
Doctoral Director(s):
Review Date:
12/27/2024
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM
Sheng-Ying (Margaret) Lo, PhD, DABCC
Sheng-Ying (Margaret) Lo, PhD, DABCC
Performing Locations