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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: White Blood Cell, Stem Cell, Peripheral Blood

Test Code(s): SCWBC / HCSCWBC

CPT Code(s): 85048

Test Description: Included In: Hematology Survey

Methodology: Flow Cytometry and Impedance

Days Performed: Daily, 24 hours.

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

Specimen Requirements

Specimen: Stem cell, peripheral blood

Collection Container: Preferred: Lavender top

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 UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location; avoid freezing.

Unacceptable Criteria: Clotted specimens are not acceptable.

Stability: Ambient: 24 hours
Frozen: Not acceptable


Reference Interval:
 Age  K/uL
 0 days-29 days  9.1-34.0
 30 days-5 months  6.0-14.0
 6 months-23 months  6.0-14.0
 2-9 years  4.0-12.0
 10-17 years  4.0-10.5
 18 years and up  3.8-10.5


Critical Calls: View

white blood cell

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