Clinics and Departments

Laboratory Services

Lab Dept:

Hematology

Test Name:

WBC COUNT, BLOOD

General Information

Lab Order Codes:

WBC

Synonyms:

White Cell Count; Total WBC; Leukocyte Count

CPT Codes:

85048 – Blood count; white blood cell (WBC)

Test Includes:

White blood count reported in K/UL (x 103/uL).

Logistics

Test Indications:

Useful in determining and following treatment for leukocytosis or leukopenia.

Lab Testing Sections:

Hematology

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 hour

Special Instructions:

N/A

Specimen

Specimen Type:

Whole blood

Container:

Lavender top tube (EDTA) or Lavender Microtainer®

Draw Volume:

2 mL blood in a Lavender tube or 0.5 mL in a Lavender top Microtainer®

Processed Volume:

Same as Draw Volume

Collection:

Fill to mark on tube or Microtainer®

Special Processing:

Lab Staff: Do not centrifuge. Process as whole blood.

Patient Preparation:

None

Sample Rejection:

Improper tube; clotted sample; underfilled tube; mislabeled or unlabeled specimens

Interpretive

Reference Range:

Age dependent; Refer to CBC Reference Value Table

Critical Values:

0 – 7 days:

<5.0 or >35.0 x 103/uL

Others:

<2.0 or >25.0 x 103/uL

Limitations:

Lipemia, elevated WBC and cold agglutinins will prolong the turn around time of an occasional specimen.

Methodology:

Automated Cell Counter

References:

Harmening DH (1997) Clinical Hematology and Fundamentals of Hemostasis, 3rd ed

Oski and Nathan (1998) Hematology of Infancy and Childhood. 5th ed

Updates:

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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