Increase platelets in which diseases

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thrombocytosis AND causes

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Merck Manual reactive thrombocytosis causes essential thrombocythemia

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Increased platelet count (thrombocytosis) occurs in:

Primary causes: myeloproliferative neoplasms

  • Essential thrombocythemia
  • Polycythemia vera
  • Chronic myeloid leukemia (CML)
  • Primary myelofibrosis (agnogenic myeloid metaplasia)

Secondary or reactive causes

  • Iron-deficiency anemia
  • Acute blood loss or hemorrhage
  • Chronic infection or inflammation, such as tuberculosis, rheumatoid arthritis, inflammatory bowel disease
  • Solid cancers/malignancies
  • After splenectomy
  • Rebound after recovery from bone marrow suppression, for example after chemotherapy
Reactive thrombocytosis accounts for most cases. Henry's Clinical Diagnosis and Management by Laboratory Methods, p. 908.
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