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Lab Dept:
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Hematology
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Test Name:
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WBC COUNT, BLOOD
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General Information
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Lab Order Codes:
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WBC
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Synonyms:
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White Cell Count; Total WBC; Leukocyte Count
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CPT Codes:
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85048 – Blood count; white blood cell (WBC)
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Test Includes:
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White blood count reported in K/UL (x 103/µL).
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Logistics
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Test Indications:
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Useful in determining and following treatment for leukocytosis or leukopenia.
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Lab Testing Sections:
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Hematology
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 hour
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Lavender top tube (EDTA) or Lavender Microtainer®
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Draw Volume:
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2 mL blood in a 5 mL EDTA tube or 0.5 mL in a Microtainer®
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Processed Volume:
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Same as Draw Volume
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Collection:
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Fill to mark on tube or Microtainer®
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Special Processing:
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Lab Staff: Do not centrifuge
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Patient Preparation:
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None
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Sample Rejection:
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Improper tube; clotted sample; underfilled tube; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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Age dependent; Refer to CBC Reference Value Table
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Critical Values:
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0 – 7 days:
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<5.0 or >35.0 x 103/µL
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Others:
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<2.0 or >25.0 x 103/µL
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Limitations:
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Lipemia, elevated WBC and cold agglutinins will prolong the turn around time of an occasional specimen.
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Methodology:
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Automated Cell Counter
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References:
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Harmening DH (1997) Clinical Hematology and Fundamentals of Hemostasis, 3rd ed
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Oski and Nathan (1998) Hematology of Infancy and Childhood. 5th ed
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Updates:
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4/29/2005: Critical values updated for 0-7 day range, previously listed as <5.0 or >30.0 x10³/uL
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