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Laboratory Test Directory

CBC and Differential


Name Method Department Units
CBC Auto Diff Reflex Manual Automated cell counter
Core Lab, Hematology

Battery Members

WBC count, RBC count, RBC indices, Hemoglobin, Hematocrit, and Platelet count, Differential (manual or automated as indicated by Pathologist determined criteria), Automated Absolute Neutrophil Count

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume

Purple tube (EDTA)

3 mL 3 mL

Purple tube (EDTA)

Micro sample tube 0.5 mL

Room temperature - 8 hour(s)
Refrigerated - 24 hour(s)

Specimen Preparation

  • Do not centrifuge

Reasons for Rejection

  • Over or under filled tube
  • Not received at proper temperature
  • Gross hemolysis
  • Clotted specimen
  • Not received within specified time frame
  • Frozen whole blood


No additional blood is required if Differential Count is ordered on the same specimen.

CPT Code

  • 85027
  • 85007