Used to measure the activity of GAPDH (glyceraldehyde-3-phosphate dehydrogenase) in human biological samples such as cell lysates, tissue extracts, or serum. This ELISA kit enables researchers to quantify GAPDH levels in studies related to cellular metabolism, apoptosis, and neurodegenerative diseases. It is commonly applied in biomedical research to assess metabolic changes in cancer, diabetes, and neurological disorders. The assay provides a sensitive and specific way to monitor GAPDH expression as a housekeeping gene or as a marker of cellular stress.