Davis's Lab & Diagnostic Tests

Complete Blood Count, WBC Count and Differential

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WBC with diff, leukocyte count, white cell count.

Common Use:
To evaluate viral and bacterial infections and to assist in diagnosing and monitoring leukemic disorders.

Whole blood from one full lavender-top (EDTA) tube.

Normal Findings:
(Method: Automated, computerized, multichannel analyzers. Many analyzers can determine a five- or six-part WBC differential. The six-part automated white blood cell [WBC] differential identifies and enumerates neutrophils, lymphocytes, monocytes, eosinophils, basophils, and immature granulocytes [IG], where IG represents the combined enumeration of promyelocytes, metamyelocytes, and myelocytes as both an absolute number and a percentage. The five-part WBC differential includes all but the immature granulocyte parameters.)

WBC Count and Differential
AgeConventional Units WBC × 103/microLNeutrophilsLymphocytesMonocytesEosinophilsBasophils
(Absolute) and %(Absolute) and %(Absolute) and %(Absolute) and %(Absolute) and %
Birth9.1–30.1(5.5–18.3) 24%–58%(2.8–9.3) 26%–56%(0.5–1.7) 7%–13%(0.02–0.7) 0%–8%(0.1–0.2) 0%–2.5%
1–23 mo6.1–17.5(1.9–5.4) 21%–67%(3.7–10.7) 20%–64%(0.3–0.8) 4%–11%(0.2–0.5) 0%–3.3%(0–0.1) 0%–1%
2–10 yr4.5–13.5(2.4–7.3) 30%–77%(1.7–5.1) 14%–50%(0.2–0.6) 4%–9%(0.1–0.3) 0%–5.8%(0–0.1) 0%–1%
11 yr–older adult4.5–11.1(2.7–6.5) 40%–75%(1.5–3.7) 12%–44%(0.2–0.4) 4%–9%(0.05–0.5) 0%–5.5%(0–0.1) 0%–1%
*SI Units (conventional units × 1 or WBC count × 109/L).

WBC Count and Differential
AgeImmature Granulocytes (Absolute) (103/microL)Immature Granulocyte Fraction (IGF) (%)
Birth–9 yr0–0.030%–0.4%
10 yr–older adult0–0.090%–0.9%

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