Used for the quantitative determination of leucine in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit employs a competitive binding technique to measure leucine levels accurately, making it valuable in metabolic research, nutritional studies, and clinical diagnostics. It is particularly useful in monitoring amino acid imbalances, evaluating protein metabolism, and investigating disorders related to branched-chain amino acids. The assay supports high-throughput analysis and provides reliable, reproducible results with a sensitive detection range suitable for low-concentration samples.