Used in biomedical research to measure cystatin C levels in human biological samples such as serum, plasma, or urine. It serves as a reliable marker for assessing kidney function, particularly glomerular filtration rate, in clinical and research settings. The kit enables early detection of renal impairment, even when creatinine levels are still normal. Widely applied in studies related to chronic kidney disease, diabetes, hypertension, and aging. Also used in monitoring transplant patients and evaluating the effectiveness of therapeutic interventions. Due to its high sensitivity and specificity, it supports accurate quantification of cystatin C without interference from inflammation or muscle mass variations. Commonly used in laboratories for immunoassay-based analysis.