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Clinical Hematology
Critical Values

Test Patient Age Critical Values

APTT All > 100 seconds

Absolute neutrophil count All outpatients < 0.500 th/uL

Absolute lymphocyte count Neonates
(<28 days)
< 2,500 th/uL

Hematocrit 0 to 6 months < 20 %

Hemoglobin All < 6 gm/dL

INR All > 7

Platelets 0 to 6 months and
all outpatients

6 months to adult
< 20,000 /uL


< 10,000 /uL

WBC All outpatients > 40,000 /uL

Rev. 11/07


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