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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: White Cell Count and Differential

Test Code(s): WBCD

CPT Code(s): 85027, 85004

Test Description: Test Components: White blood cell count and WBC Differential. Use of manual microscopy for WBC differential is determined by laboratory personnel during testing.

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: K3EDTA-Lavender top
Also Acceptable: K2EDTA-Lavender top, Pink top tube

Collection Volume: Preferred: 4 mL
Pediatrics: 1 mL

Sample Analyzed: Whole Blood

Volume Required: Preferred: 1 mL
Pediatrics: 0.25 mL in microtainer

Specimen Transport: Transport specimen to the laboratory at ambient temperature.

Unacceptable Criteria: Clotted specimens are not acceptable. Tubes with <25% of fill volume.

Stability: Ambient: Differential - 8 hours. WBC - 24 hr
Refrigerated: Not acceptable
Frozen: Not acceptable


Reference Interval:

For reference interval information, see individual tests.

Additional Information:

Differential results may be delayed if a hematopathologist review is warranted. A professional fee may be associated with this test.

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