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Normal Values of Erythrocytes, Leukocytes, and Platelets in Adult Human Blood*

Erythrocytes

Male:4.3–5.7 million/μL blood

Female:3.9–5.1 million/μL blood

Hemoglobin

Male:13.5–17.5 g/dL

Female:12.0–15.5 g/dL

Hematocrit

Male:38.8%–50%

Female:34.9%–44.5%

Platelets

150,000–450,000/μL of blood

White blood cells

4000–11,000/μL of blood

Types of leukocytes

Percentage of total leukocytes

Primary role

Polymorphonuclear granulocytes

  • Neutrophils

40–80

Phagocytosis

  • Eosinophils

1–6

Allergic hypersensitivity reactions

  • Basophils

<1–2

Allergic hypersensitivity reactions

Monocytes

1–6

Phagocytosis and antibody production

Lymphocytes

20–40

Antibody production and cell-mediated immunity

*Normal reference ranges vary somewhat with age 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 examining data.

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