Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

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

FREE T4, DIRECT DIALYSIS

ORDERING INFORMATION:
Geisinger Epic Procedure Code: LAB2311         Geisinger Epic ID: 44051

SPECIMEN COLLECTION
Specimen type:
Serum
Preferred collection container:
Specimen required:
1 mL aliquot of serum; minimum 0.8 mL.

SPECIMEN PROCESSING
Specimen processing instructions:
Allow to clot. Centrifuge and transfer serum specimens to clean, plastic, screw-capped vial(s). Transport on refrigerant coolant. 
Transport temperature:
Refrigerated (preferred) or frozen.
Specimen stability:
Room Temperature: 7 days. Refrigerated: 7 days. Frozen: 28 days (-20°C).
Rejection criteria:
Stability limits exceeded.

TEST DETAILS
Reference interval:
Prematures, 25-30 Weeks 
Birth-7 Days 0.5-3.3 ng/dL
Prematures, 31-36 Weeks 
Birth-7 Days 1.3-4.7 ng/dL
Cord Blood, >37 Weeks   1.2-2.2 ng/dL
Birth-4 Days 2.2-5.3 ng/dL
2 Weeks-2 Years 0.8-2.0 ng/dL
3-20 Years 1.0-2.4 ng/dL
21-87 Years 0.8-2.7 ng/dL
Pregnancy  
First Trimester 0.9-2.0 ng/dL
Second Trimester 0.8-1.5 ng/dL
Third Trimester 0.8-1.7 ng/dL
CPT code(s):
84439
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:
Free T4 by Equilibrium Dialysis Including Total T4
Methodology:
Equilibrium Dialysis
Synonyms:
Free T4 by Equilibrium Dialysis
Quest test code 35167
FT4

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Mon-Thurs a.m., report available: 2 days    
Performed stat? No
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