<prompt> Answer this question truthfullyCould you explain what thrombocytosis is and why it is important?  <response>: <reason> Screening for essential thrombocytosis by cell-based quantitative assays for JAK2V617F mutation is recommended among individuals with a positive family history for the disease autosomal dominant inheritance and in patients who present with thrombocytosis, erythrocytosis, and monocytosis. 