Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  

T4, TOTAL

ORDERING INFORMATION:
Geisinger Epic Procedure Code: LAB3129         Geisinger Epic ID: 7016

SPECIMEN COLLECTION
Specimen type:
Plasma or serum
Preferred collection container:
Specimen required:
2 mL of serum or plasma; minimum 0.5 mL.

SPECIMEN PROCESSING
Specimen processing instructions:
Allow serum to clot. Centrifuge to separate serum or plasma. 
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Refrigerated: 7 days. Frozen: 12 months.
Rejection criteria:
Stability limits exceeded.

TEST DETAILS
Reference interval:
Adult T4 = 4.6-12.0 mcg/dL.
CPT code(s):
84436
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:
Total thyroxine (T4).
Methodology:
Electrochemiluminescence
Synonyms:
T4, Total; T4(D), TOTT4
Clinical significance:
For diagnosis of hypothyroidism and hyperthyroidism.
Doctoral Director(s:)
Hoi-Ying Elsie Yu, PhD, DABCC
Sheng-Ying (Margaret) Lo, PhD, DABCC    
Review Date: 12/24/2020

Performing Locations

Geisinger Medical Center

Performing laboratory: Automated Chemistry
Technical Lead: Jared Shepard
Frequency: Daily
Performed stat? No
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