Used in biomedical research to quantitatively measure renin levels in human serum, plasma, or other biological samples. Enables study of the renin-angiotensin system, which plays a key role in blood pressure regulation and fluid balance. Commonly applied in research on hypertension, kidney disease, and cardiovascular disorders. Provides a reliable, sensitive, and high-throughput method for detecting renin concentration, supporting both clinical investigations and drug development studies targeting renin activity.