White Blood Cell Count (WBC)

What it measures

• White Blood Cell CountLOINC 6690-2

Specimen

Specimen

Whole blood from a full EDTA (lavender-top) tube

Minimum volume

Microtainer 0.5 mL • 1 mL whole blood EDTA tube

Also accepted

Whole blood from a full EDTA (tan-top) tube

Container

EDTA (lavender-top) tube

Temperature

Room temperature

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.

Turnaround

Set up: Daily (Day shift and Night shift); Report available: 2 days

Billing

CPT 85048