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White Blood Cell (WBC) Count

CPT: 85048
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Synonyms

  • Leukocyte Count
  • WBC
  • White Count

Expected Turnaround Time

Within 1 day


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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