Appendix A

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Lange Cardiovascular Physiology > Appendix A >

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

Normal Values of Erythrocytes, Leukocytes, and Platelets in Adult Human Blood¹

Erythrocytes	4.0 5.5 million/L of blood
Platelets	130,000 400,000/L of blood
Leukocytes	4,000 10,000/L of blood

Type of leukocyte	Percent total leukocytes	Primary role
Polymorphonuclear granulocytes
Neutrophils	50 70	Phagocytosis
Eosinophils	1 4	Allergic hypersensitivity reactions
Basophils	0 0.75	Allergic hypersentivity reaction
Monocytes	2 8	Phagocytosis and antibody production
Lymphocytes	15 40	Antibody production and cell-mediated immunity

¹ Normal reference ranges vary somewhat with age, gender, and race. They also may vary from lab to lab. 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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