Used in biomedical research to quantitatively measure levels of human plasma kallikrein (KLKB1) in biological samples such as plasma, serum, or cell culture supernatants. This ELISA kit is particularly valuable in studies related to inflammation, coagulation, and the kinin-kallikrein system. Researchers use it to investigate conditions like hereditary angioedema, sepsis, cardiovascular diseases, and thrombotic disorders where kallikrein activity plays a regulatory role. The assay enables high sensitivity and specificity, supporting both clinical research and drug development efforts targeting kallikrein-mediated pathways.