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

UW Hospital and Clinics Lab Test Directory

Test Name: CBC without Differential

Test Code(s): HS / HEMO

CPT Code(s): 85027

Test Description: Test Component:

White blood cell count, red blood cell count, hemoglobin, hematocrit, MCV, MCHC, RDW CV, RDW SD, and platelet.

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: HCT, MCV, RDW CV, RDW SD, MCHC- 8 hours. WBC, RBC, Hgb, Platelet, - 24 hr
Refrigerated: Not acceptable
Frozen: Not acceptable


Reference Interval:

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 days-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/fL

Critical Calls: View

RDW RBC Indices MCV MCHC Indices RBC Complete Blood Count Hematology Survey

Back to Lab Test Directory Index