This study aimed to evaluate and compare the levels of select prothrombotic biomarkers - fibrinogen, C-reactive protein (CRP), D-dimer, von Willebrand Factor (vWF), homocysteine, lactate dehydrogenase (LDH), and platelet-to-lymphocyte ratio (PLR) - in patients with stable COPD and AECOPD, and to assess their diagnostic and prognostic significance. The gene discussed is CRP; the disease is chronic obstructive pulmonary disease.