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Erythrocytes

4.0–5.5 million/μL of blood

Platelets

130,000–400,000/μL of blood

Leukocytes

4000–10,000/μL of blood

Types of leukocytes

Percent total leukocytes

Primary role

Polymorphonuclear granulocytes

Neutrophils

50–70

Phagocytosis

Eosinophils

1–4

Allergic hypersensitivity reactions

Basophils

0–0.75

Allergic hypersensitivity reaction

Monocytes

2–8

Phagocytosis and antibody production

Lymphocytes

15–40

Antibody production and cell-mediated immunity

*Normal reference ranges vary somewhat with age, gender, and race. They may also vary from laboratory to laboratory. To confuse the issue further, various unit measurements are used to report blood data, and so caution must be used in interpreting data.

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