Skip to Content
UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Differential without WBC

Test Code(s): D1 / DIFF

CPT Code(s): 85004

Test Description: Test Component:

WBC Differential, RBC morphology and platelet evaluation.
Use of manual microscopy for WBC differential is determined by laboratory personnel during testing.

Included In: CBC with Differential, WBC and Differential

Methodology: Flow Cytometry, Impedance, and where applicable, Manual Microscopy

Days Performed: Daily, 24 hours- all ER specimens performed stat and General Peds/Adolescent Med (GPAM) specimens performed stat upon request (please mark on request form).

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 laboratory at ambient temperature.

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

Stability: Ambient: 8 hours
Refrigerated: Not acceptable
Frozen: Not acceptable


Reference Interval:



Note:  Reference Intervals for relative percent (%) can be found on the patient report.


 Age 18 years and up:   
 WBC Neuts Lymphs  
 K/uL cells/uL cells/uL  
 3.8-10.5  1700-7500 1000-3500  
 Monos Eos Basos  
 cells/uL cells/uL cells/uL  
 200-900 0-500 0-200  
 Pediatric Reference Interval*    
 Age  WBC  Neutrophils  Lymphocytes
   K/uL  cells/uL  cells/uL
 0-29 days   9.1-34.0  6000-23500  2500-10500

 30 days-23


 6.0-14.0  1100-6600  1800-9000
 2-9 years    4.0-12.0  1400-6600  1000-5500
 10-17 years    4.0-10.5  1500-6600  1000-3500
 Age  Monocytes  Eosinophils  Basophils
   cells/uL  cells/uL  cells/uL
 0-29 days    < 3500  < 2000  < 400

 30 days-23


 < 1000  < 700  < 100
 2-9 years    < 1000  < 700  < 100
 10-17 years    < 1000  < 700  < 100


*from Children's Hospital of Buffalo, 1995/Verified by

  Milwaukee Children's Hospital

Critical Calls: View

Additional Information:

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

Back to Lab Test Directory Index