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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Red Cell Count

Test Code(s): RBC / HCRBC

CPT Code(s): 85041

Test Description: Included In: CBC with Differential, CBC without Differential

Methodology: Flow Cytometry and Impedance

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 laboratory at ambient temperature.

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

Stability: Ambient: 24 hours
Refrigerated: Not acceptable
Frozen: Not acceptable


Reference Interval:
 Age  M/uL
 0-29 days  4.1-6.7
 30 days-5 months  2.7-5.4
 6 months-23 months  3.8-5.4
 2-9 years  4.0-5.3
 10-17 years, male  4.2-5.6
 10-17 years, female  4.1-5.3
 18 years and up, male  4.4-5.8
 18 years and up, female  3.8-5.2


Red Blood Cell

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