Used to measure the activity of KLKB1 (kallikrein B1) in rat biological samples such as plasma or serum. This ELISA kit enables researchers to quantify the levels of active KLKB1, which plays a role in the kinin-kallikrein system involved in inflammation, blood pressure regulation, and coagulation. It is commonly used in preclinical studies focusing on cardiovascular diseases, inflammatory conditions, and renal function in rat models. The assay supports high sensitivity and specificity, allowing for accurate detection of changes in KLKB1 activity under experimental treatments or disease states.