White Blood Cell Count (WBC)

Test Code

937

CPT Code(s)

85048

CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.

Test Code

937

CPT Code(s)

85048

CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.

Not offered in Quest Nichols Institute - Chantilly, VA | Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano | Quest Nichols Institute -San Juan Capistrano, CA. Please provide SERVICE AREA INFORMATION to find available tests you can order.

In-home collection may be available in your area for purchase through Quest Mobile.

Clinical Significance

White Blood Cell Count (WBC) - Most commonly utilized test to monitor characteristic response to infection. Diagnostically useful for diseases such as leukemia, leukocyte disorders, as well as monitoring therapy of these diseases.

Test Resources

None found for this test
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Test Details

Methodology

Electronic Cell Sizing/Counting/Cytometry/Microscopy

Reference Range(s)

≤2 Weeks	9.0-30.0 Thousand/µL
3 Months	5.0-19.5 Thousand/µL
1 Year	6.0-17.5 Thousand/µL
2 Years	6.0-17.0 Thousand/µL
6 Years	5.0-16.0 Thousand/µL
12 Years	4.5-13.5 Thousand/µL
18 Years	4.5-13.0 Thousand/µL
>18 Years	3.8-10.8 Thousand/µL

Alternative Name(s)

Leukocyte Count,WBC

LOINC® Codes, Performing Laboratory

Service Area must be determined

Methodology

Electronic Cell Sizing/Counting/Cytometry/Microscopy

Reference Range(s)

≤2 Weeks	9.0-30.0 Thousand/µL
3 Months	5.0-19.5 Thousand/µL
1 Year	6.0-17.5 Thousand/µL
2 Years	6.0-17.0 Thousand/µL
6 Years	5.0-16.0 Thousand/µL
12 Years	4.5-13.5 Thousand/µL
18 Years	4.5-13.0 Thousand/µL
>18 Years	3.8-10.8 Thousand/µL

Alternative Name(s)

Leukocyte Count,WBC

LOINC® Codes, Performing Laboratory

Service Area must be determined

Preferred Specimen(s)

Whole blood from a full EDTA (lavender-top) tube

Alternative Specimen(s)

Whole blood from a full EDTA (tan-top) tube

Minimum Volume

Microtainer 0.5 mL • 1 mL whole blood EDTA tube

Collection Instructions

Maintain specimen at room temperature. Do not refrigerate. If multiple draw, collect EDTA (lavender-top) tube last. Mix by gently inverting 8 times. Traumatic draw can introduce thromboplastin and trap WBC and platelets. Refrigeration can precipitate fibrin and trap WBC and platelets.

Note: If drawn with lead testing, EDTA (tan-top) is required.

Transport Container

EDTA (lavender-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 48 hours

Reject Criteria

Hemolysis • Clotted

Setup Schedule

Service Area must be determined

Preferred Specimen(s)

Whole blood from a full EDTA (lavender-top) tube

Alternative Specimen(s)

Whole blood from a full EDTA (tan-top) tube

Minimum Volume

Microtainer 0.5 mL • 1 mL whole blood EDTA tube

Collection Instructions

Transport Container

EDTA (lavender-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 48 hours

Reject Criteria

Hemolysis • Clotted

Setup Schedule

Service Area must be determined

In-home collection may be available in your area for purchase through Quest Mobile.

Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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