Used in biomedical research to quantify levels of human coagulation factor Xa (FXa) in plasma or serum samples. Enables researchers to study blood coagulation pathways, evaluate anticoagulant drug effects, and investigate thrombotic disorders. Commonly applied in preclinical studies, drug development, and diagnostic research related to hemostasis and thrombosis. Provides a sensitive and specific method for monitoring FXa activity in cell culture supernatants or purified protein samples. Widely used in laboratories focusing on cardiovascular disease mechanisms and anticoagulant therapy optimization.