Used for quantifying gamma-glutamyl hydrolase (GGH) enzyme activity in human biological samples such as serum, plasma, or tissue lysates. This ELISA kit enables researchers to assess GGH levels in studies related to folate metabolism, methotrexate resistance in cancer therapy, and hematological disorders. It is commonly applied in clinical research and pharmaceutical development to monitor enzyme activity changes associated with drug response or disease progression. The assay provides a sensitive and specific colorimetric measurement, allowing high-throughput analysis in laboratory settings.