Cytokeratin 19 Fragment 21-1(CYFRA21-1) CLIA kit (Chemiluminescence Immunoassay) is an in vitro diagnostic quantitative test kit. Cytokeratins are structural proteins forming the subunits of epithelial intermediary filaments. The assay is to be used as an aid in monitoring disease

progression during the course of disease and treatment in lung cancer patients. Serial testing for patient CYFRA 21-1 assay values should be used in conjunction with other clinical methods used for monitoring lung cancer.