UW Hospital and Clinics Lab Test Directory
| Test Name: |
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CBC with Differential
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| Test Code(s): |
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CBC
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| CPT Code(s): |
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85025
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| Test Description: |
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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.
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Container: |
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Preferred: K3EDTA-Lavender top
Also Acceptable:
K2EDTA-Lavender top
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| Collection Volume: |
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Preferred: 4 mL
Pediatrics: 1 mL
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| Sample Analyzed: |
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Whole Blood
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| Volume Required: |
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Preferred: 1 mL
Pediatrics: 0.25 mL in microtainer
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| Specimen Transport: |
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Transport specimen to the laboratory at ambient temperature.
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| Unacceptable Criteria: |
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Clotted specimens are not acceptable. Tubes with <25% of fill volume.
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| Stability: |
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Ambient: HCT, MCV, RDW CV, RDW SD, MCHC, Differential - 8 hours. WBC, RBC, Hgb, Platelet, - 24 hr
Refrigerated: Not acceptable
Frozen: Not acceptable
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Interpretation
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Reference Interval:
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For reference interval information,
see individual tests.
| RDW CV reference interval: |
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| 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: |
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| 18 years and up |
36.0-46.0 fL |
| MCV reference interval: |
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| 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: |
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| 0 days and up: |
32-36 g/dL |
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