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Table. Normal Leukocyte Counts

Table. Normal Leukocyte Counts

	Total Leukocytes^*		Lymphocytes			Neutrophils^†			Monocytes		Eosinophils
Age	Mean	Range	Mean	Range	%	Mean	Range	%	Mean	%	Mean	%
Birth	...	...	4.2	2-7.3	...	4	2-6	...	0.6	...	0.1	...
12 h	...	...	4.2	2-7.3	...	11	7.8-14.5	...	0.6	...	0.1	...
24 h	...	...	4.2	2-7.3	...	9	7-12	...	0.6	...	0.1	...
1-4 wk	...	...	5.6	2.9-9.1	...	3.6	1.8-5.4	...	0.7	...	0.2	...
6 mo	11.9	6-17.5	7.3	4-13.5	61	3.8	1-8.5	32	0.6	5	0.3	3
1 y	11.4	6-17.5	7.0	4-10.5	61	3.5	1.5-8.5	31	0.6	5	0.3	3
2 y	10.6	6-17	6.3	3-9.5	59	3.5	1.5-8.5	33	0.5	5	0.3	3
4 y	9.1	5.5-15.5	4.5	2-8	50	3.8	1.5-8.5	42	0.5	5	0.3	3
6 y	8.5	5-14.5	3.5	1.5-7	42	4.3	1.5-8	51	0.4	5	0.2	3
8 y	8.3	4.5-13.5	3.3	1.5-6.8	39	4.4	1.5-8	53	0.4	4	0.2	2
10 y	8.1	4.5-13.5	3.1	1.5-6.5	38	4.4	1.8-8	54	0.4	4	0.2	2
16 y	7.8	4.5-13	2.8	1.2-5.2	35	4.4	1.8-8	57	0.4	5	0.2	3
21 y	7.4	4.5-11	2.5	1-4.8	34	4.4	1.8-7.7	59	0.3	4	0.2	3
^* Numbers of leukocytes are in X 10⁹ \L or thousands per μ L; ranges are estimates of 95% confidence limits; and percentages refer to differential counts. ^† Neutrophils include band cells at all ages and a small number of metamyelocytes and myelocytes in the first few days of life.

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Author

Susumu Inoue, MD Professor of Pediatrics and Human Development, Michigan State University College of Human Medicine; Clinical Professor of Pediatrics, Wayne State University School of Medicine; Director of Pediatric Hematology/Oncology, Hurley Medical Center

Susumu Inoue, MD is a member of the following medical societies: American Academy of Pediatrics, American Medical Association, American Society of Hematology, American Society of Pediatric Hematology/Oncology, Society for Pediatric Research

Disclosure: Nothing to disclose.

Specialty Editor Board

Mary L Windle, PharmD Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Nothing to disclose.

Gary D Crouch, MD Associate Professor, Program Director of Pediatric Hematology-Oncology Fellowship, Department of Pediatrics, Uniformed Services University of the Health Sciences

Gary D Crouch, MD is a member of the following medical societies: American Academy of Pediatrics, American Society of Hematology

Disclosure: Nothing to disclose.

Chief Editor

Jennifer Reikes Willert, MD Associate Clinical Professor, Department of Pediatrics, Division of Pediatric Hematology/Oncology, Section of Stem Cell Transplantation, Stanford University Medical Center, Lucile Packard Children's Hospital

Jennifer Reikes Willert, MD is a member of the following medical societies: American Academy of Pediatrics, American Society for Blood and Marrow Transplantation, American Society of Hematology, American Society of Pediatric Hematology/Oncology, Children's Oncology Group

Disclosure: Nothing to disclose.

Acknowledgements

Gary R Jones, MD Associate Medical Director, Clinical Development, Berlex Laboratories

Gary R Jones, MD is a member of the following medical societies: American Academy of Pediatrics, American Society of Pediatric Hematology/Oncology, and Western Society for Pediatric Research

Disclosure: Nothing to disclose.