Platelet count

by: Joe Hing kwok Chu

Adult normal range: 150,000 ~ 400,000 µL Pediatric Reference Range: Newborns 1 week: 150,000 ~ 250,000 µL Purposes of test:

Lower than normal:

thrombocytopenia which can be caused by hemorrhagic diseases, acute myelocytic leukemia, drug allergy, congenital causes and neutropenia.

Higher than normal (thrombocytosis):

polycythemia (high red cell count), essential thrombocytosis, following spleenectomy, infections, anemia, iron deficiency, malignant lymphoma, hemorrhage, response to exercise.

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