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White Blood Cell Count (WBC) and Differential
Test Code7064
CPT Codes
82384, 85004, 85048
Includes
WBC and Differential (Absolute and Percent - Neutrophils, Lymphocytes, Monocytes, Eosinophils, and Basophils)
Preferred Specimen
Whole blood from a full EDTA (lavender-top) tube
Minimum Volume
Microtainer 0.5 mL • 1 mL whole blood EDTA tube
Other Acceptable Specimens
Whole blood from a full EDTA (tan-top) tube
Instructions
Maintain specimen at room temperature. Do not refrigerate. If multiple draw, collect EDTA (lavender-top) tube last. Mix by gently inverting 8 times. Traumatic draw can introduce thromboplastin and trap WBC and platelets. Refrigeration can precipitate fibrin and trap WBC and platelets.
Note: If drawn with lead testing, EDTA (tan-top) is required.
Note: If drawn with lead testing, EDTA (tan-top) is required.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 48 hours
Refrigerated: 48 hours
Frozen: Unacceptable
Refrigerated: 48 hours
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Clotted
Methodology
Electronic Cell Sizing/Counting/Cytometry/Microscopy
Setup Schedule
Set up: Mon-Sat; Report available: Next day
Reference Range
See Laboratory Report
Clinical Significance
A screening test for various disease states to include leukemia and inflammatory processes.