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A 57-year-old male asked:

What causes thrombocytosis?

2 doctor answers4 doctors weighed in
Dr. Michael Thompson
Hematology and Oncology 20 years experience
Primary or secondary: Elevated platelets (thrombocytosis) can be primary (driven by a bone marrow disorder) or secondary (eg, reactive). Reactive/secondary is the most common, with some frequent associated conditions including iron deficiency anemia, reactive (eg, pneumonia, rheumatoid arthritis, post surgical). Thrombocytosis that goes away is likely reactive. Primary can be evaluated for by labs & bone marrow biopsy.
Dr. Christian Schultheis
Hematology and Oncology 24 years experience
Many things: It could be reactive, such as infection, recent surgery, malignancy, iron deficiency. Other causes can include myeloproliferative disorders. These include essential thrombocytosis, polycythemia, myelofibrosis, chronic myelogenous leukemia. Hope this helps.

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Last updated Mar 14, 2019

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