CBC, & Diff

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

Test Code

Alias/See Also
CBC w/Auto Diff

CPT Codes

Preferred Specimen
3 mL or 4 mL whole blood K2EDTA (lavender top) tube(s) or K2EDTA (Microtainer® lavender top) tube(s). 

Minimum Volume
Minimum fill 1 mL (Microtainer® filled between the 2 lines).

Avoid hemolysis. Gently invert 10 times immediately at time of collection.

Transport Container
K2EDTA (lavender top) tube

Transport Temperature

Specimen Stability
Room Temperature = 24 hours
Refrigerated = 48 hours
Any questions see Hematology Tech Specialist before rejecting


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Rejected for gross hemolysis, clotted, <1 mL, non-K2EDTA tube type, >48 hours old, frozen.  Any questions see Hematology Tech Specialists before rejecting

Automated Cell Counter

Setup Schedule
Sunday - Saturday

Performing Laboratory
CompuNet Clinical Laboratories, LLC
2308 Sandridge Drive
Moraine, OH 45439

Last Updated: August 4, 2022

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.