Polyanetholesulfonic acid sodium is widely used as an anticoagulant in blood collection tubes, particularly for hematology and serology tests. It helps prevent blood clotting by inhibiting the activation of coagulation factors, ensuring accurate diagnostic results. Additionally, it is employed in microbiology as a component of culture media to neutralize the antimicrobial effects of blood samples, promoting the growth of microorganisms. Its ability to stabilize biological samples makes it valuable in research and clinical laboratories.