Apr 2, 2015




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Hematology

CBC with Differential

CBC with Differential (CBC) Hematology Lab Test

Name: CBC with Differential

Test Name: CBC with Differential

Health Link Test Code: CBC

LIS Test Code: CBC

CPT Code(s): 85025

Test Component:

White blood cell count, red blood cell count, hemoglobin, hematocrit, MCV, MCHC, RDW CV, RDW SD, and platelet. WBC Differential, RBC morphology and platelet evaluation.

Use of manual microscopy for WBC differential is determined by laboratory personnel during testing.

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: K3EDTA-Lavender top

Also Acceptable: K2EDTA-Lavender top, Pink top tube

Collection Volume: 4 mL

Pediatric Collection Volume: 1 mL

Stability Ambient:

HCT, MCV, RDW CV, RDW SD, MCHC, Differential - 8 hours.

WBC, RBC, Hgb, Platelet - 24 hr

Stability Refridgerated:

Not acceptable

Stability Frozen:

Not acceptable

Sample Analyzed: Whole Blood

Testing Volume: 1 mL

Pediatric Testing Volume: 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.


For reference interval information,

     see individual tests.

RDW CV reference interval:  
   Age %
   0 days-29 days 11.5-18.0
   30 days-23 months 10.0-16.0
   2-9 years 10.0-15.0
   10-17 years 10.0-14.0
   18 years and up 11.7-14.7
RDW SD reference interval:  
   18 years and up 36.0-46.0 fL
MCV reference interval:  
   Age fL
   0-29 days 102-115
   30 days-5 months 74-115
   6 months-23 months 72-88
   2-9 years 76-90
   10-17 years 78-95
   18 years and up 80-97
MCHC reference interval:  
   0 days and up: 32-36 g/dL

Interpretation Type: Reference Interval

Additional Information:

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