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Laboratory Test Directory

Manual Differential (Updated)


Name Method Department Units
WBC Manual Differential Manual microscopy
Core Lab, Hematology %

Battery Members

Manual microscopic evaluation of visually identified white blood cells

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

  • Clotted specimen
  • Wrong collection tube
  • Over or under filled tube
  • Not received within specified time frame
  • Not received at proper temperature


Must be ordered with CBC. No additional blood required for the CBC.

CPT Code

  • 85007