Used in biomedical research to quantitatively measure streptokinase levels in human serum, plasma, or cell culture samples. Enables detection of streptokinase activity associated with streptococcal infections, aiding in the study of fibrinolysis and thrombolytic therapy. Commonly applied in clinical laboratories and research settings to evaluate the efficacy of clot-dissolving treatments and to investigate host-pathogen interactions in streptococcal diseases. Provides a sensitive and specific method for monitoring streptokinase concentration, supporting studies on cardiovascular disorders and bacterial virulence mechanisms.