Specimen Collection Manual and Test Catalog
T3, FREE
Geisinger Epic Procedure Code: LAB3123 Geisinger Epic ID: 7038SPECIMEN COLLECTION
Specimen type:
Plasma or Serum
Preferred collection container:
Specimen required:
2 mL of serum or plasma; 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):
84481 2.5 - 4.3 pg/mL
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:
Free triiodothyronine.
Methodology:
Electrochemiluminescence
Synonyms:
Free T3, FT3, FREET3, Free triiodothyronine
Clinical significance:
This test is used to diagnose hyperthyroidism and to clarify thyroid status in the presence of possible protein binding abnormality.
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