WBC Cystine

Tube Top = Yellow Top

Tube Type

ACD Solution A

Test ID   LAB5905
EPIC Order   WBC CYSTINE
CPT Code(s)   83789
Group/Individual Test   Group
Laboratory   Core Referral Testing
Tube Station   30
Specimen Routine: 8.5 mL blood/Yellow ACD-A tube; See Comments 
   Micro: 3 mL blood
Availability Routine: Reference Laboratory - UCSD
Turnaround Time   2-3 weeks
Reference Range Normal: See separate report
Comments
Specimen must be collected Monday-Thursday right before medication dose (trough level), and received in laboratory by 2:45 pm.
Sample MUST BE REFRIGERATED within 1 hour of collection.

Reviewed by J. Carr on December 15, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514