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The Cystatin C Human ELISA (Enzyme-Linked Immunosorbent Assay) Kit is a specialized tool used in clinical research and diagnostics to measure the concentration of Cystatin C in human biological fluids. Cystatin C is a low-molecular-weight protein produced at a constant rate by all nucleated cells. It is freely filtered by the glomerulus in the kidneys, making it an excellent biomarker for assessing renal function, particularly the glomerular filtration rate (GFR). Compared to traditional markers like creatinine, Cystatin C is less influenced by factors such as muscle mass, age, sex, or diet. This makes the ELISA kit particularly valuable for monitoring kidney health in populations where creatinine levels might be misleading, such as the elderly, children, or those with chronic illness. The kit uses the sandwich ELISA method, where the protein is captured between two specific antibodies, providing high sensitivity and precision in quantification.