White Blood Cell (WBC) Count

CPT: 85048
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Test Details

Synonyms

  • Leukocyte Count
  • WBC
  • White Count

Use

White cell enumeration; identify leukopenia and leukocytosis

Methodology

Automated cell counter

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.)

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

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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The LOINC® codes are copyright © 1994-2017, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf