White Blood Cell (WBC) Count

TEST: 005025
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CPT: 85048
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Synonyms

  • Leukocyte Count
  • WBC
  • White Count

Expected Turnaround Time

Within 1 day

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Related Documents

Specimen Requirements

Specimen

Whole blood

Volume

Tube fill capacity

Minimum Volume

0.5 mL (500 μL for pediatric microtainer capillary tubes; fill tube to capacity.) (Note: This volume does not allow for repeat testing.)

Container

Lavender-top (EDTA) tube

Collection

Invert tube immediately 8 to 10 times once tube is filled at time of collection.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Temperature

Period

Room temperature

1 day

Refrigerated

3 days

Frozen

Unstable

Freeze/thaw cycles

Unstable

Causes for Rejection

Hemolysis; clotted specimen; tube not filled with minimum volume; improper labeling; specimen received in any anticoagulant other than EDTA; specimen received with plasma removed; specimen diluted or contaminated with IV fluid; specimen received in whole blood transport tube

Test Details

Use

White cell enumeration; identify leukopenia and leukocytosis

Methodology

Automated cell counter

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
005025 WBC 6690-2 005025 WBC x10E3/uL 6690-2

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