Eosinophilia and thrombocytosis workup was performed to exclude other reasons, and it was unremarkable, including lactate dehydrogenase (LDH), immunoglobulin E (IgE) level, BCR/ABL (breakpoint cluster region, Abelson murine leukemia), JAK2 tyrosine-protein kinase mutation, ova, and parasite. The gene discussed is JAK2; the disease is Increased total eosinophil count.