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White Blood Cell (WBC) Count CPT: 85048

Synonyms

Leukocyte Count

WBC

White Count

Expected Turnaround Time

Within 1 day

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 8 to 10 times immediately after tube is filled at the time of collection.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Patient Information

To screen for or diagnose a variety of conditions that can affect the number of white blood cells (WBCs), such as an infection, inflammation or a disease that affects WBCs; to monitor treatment of a disorder or to monitor therapy that is known to affect WBCs.

As part of a complete blood count (CBC), when you have a routine health examination; when you have signs and symptoms that may be related to a condition affecting the number of WBCs; when you have a condition or are receiving treatment that is known to affect WBCs.

A blood sample drawn from a vein or by a fingerstick (children and adults) or heelstick (newborns).