Reference Values

WBC

Age 0 up to 4 days:  9.0-35.0 k/µL

Age 4 days up to 10 days:  5.0-21.0 k/µL

Age 10 days up to 15 days:  5.0-20.0 k/µL

Age 15 days up to 1 month:  5.0-19.5 k/µL

Age 1 month up to 7 months:  6.0-17.5 k/µL

Age 7 months up to 25 months:  6.0-17.0 k/µL

Age 25 months up to 5 years:  5.5-15.5 k/µL

Age 5 years up to 9 years:  5.0-14.5 k/µL

Age 9 years up to 13 years:  4.5-13.5 k/µL

Age 13 years up to 18 years:  4.5-13.0 k/µL

Over 18 years:  4.0-11.0 k/µL

Critical Value: <2.0 k/µL or >50.0 k/µL

Neutrophils, % / absolute #

Age 0 up to 4 days:  32-62% / 3-28#

Age 4 days up to 10 days:  19-49% / 1-13#

Age 10 days up to 15 days:  14-34% / 1-10#

Age 15 days up to 1 month:  15-35% / 1-9#

Age 1 month up to 7 months:  13-33% / 1-8#

Age 7 months up to 25 months:  15-35% /1-8#

Age 25 months up to 5 years:  23-45% / 1.5-8.5#

Age 5 years up to 9 years:  32-54% / 1.5-9#

Age 9 years up to 13 years:  33-61% / 1.5-9.5#

Age 13 years up to 18 years:  34-64% / 1.5-9.5#

Over 18 years:  40-75% / 2.0-7.8#

Bands

Age 0 up to 4 days:  0-18%

Age 4 days up to 10 days:  0-15%

Age 10 days up to 15 days:  0-14%

Age 15 days up to 1 month:  0-12%

Over 1 month:  0-11%

Lymphocytes % / absolute #

Age 0 up to 4 days:  19-29% / 2-10#

Age 4 days up to 10 days:  26-36% / 2-8#

Age 10 days up to 15 days:  36-45% / 2-9#

Age 15 days up to 1 month:  43-53% / 2-10#

Age 1 month up to 7 months:  41-71% / 2-12#

Age 7 months up to 25 months:  45-76% / 3-13#

Age 25 months up to 5 years:  35-65% / 2-10#

Age 5 years up to 9 years:  28-48% / 1.4 - 7#

Age 9 years up to 13 years:  28-48% / 1.3-6.5#

Age 13 years  up to 18 years:  25-45% / 1.1-6#

Over 18 years:  15-50% / 1-4#

Monocytes %

Age 0 up to 4 days:  6-18%

Age 4 days up to 10 days:  7-18%

Age 10 days up to 15 days:  4-18%

Age 15 days up to 1 month:  4-16%

Age 1 month up to 7 months:  4-14%

Age 7 months up to 25 months:  4-12%

Age 25 months up to 18 years:  4-10%

Over 18 years:  2-13%

Monocytes absolute #

Age 0 up to 1 day:  0.2-2.2#

Age 1 day up to 1 week:  0.3-1.9#

Age 1 week up to 2 weeks:  0.3-1.7#

Age 2 weeks up to 1 month:  0.3-1.1#

Age 1 month up to 1 year:  0.2-1 #

Age 1 year up to 4 years:  0.1-0.9#

Age 4 years up to 16 years:  0.1-0.7#

Age 16 years up to 18 years:  0.1-0.5#

Over 18 years:  0.1-1.0 #

Eosinophils % / Absolute #

Age 0 up to 1 months:  0-2% / 0.2-0.7#

Age 1 month up to 18 years:  0-3% / 0.2-0.7#

Over 18 years:  0-8% / 0.2-0.7#

Basophils % / Absolute #

Age 0 up to 18 years:  0-1% / ≤0.2#

Over 18 years:  0-2% / ≤0.2#

Critical Values:
Blasts seen on smears (unless previously known).