Thrombocytosis is a marker of poor outcome in community-acquired pneumonia

Thrombocytosis, often considered a marker of normal inflammatory reaction of infections, has been recently associated with increased mortality in hospitalized patients with community-acquired pneumonia (CAP). We assessed the characteristics and outcomes of patients with CAP and thrombocytosis (platelet count = 4 × 105/mm3) compared with thrombocytopenia (platelet count < 105/mm3) and normal platelet count.