Cytokeratin 6.73ng/ml can’t determine the severity, further examination is needed to clarify the cause. Cytokeratin belongs to a special protein class of tumor markers, and the normal value is 3.3ng/ml. elevated cytokeratin is considered to be related to lung cancer, bladder cancer, female reproductive system tumors, digestive tract tumors and some benign diseases. However, an elevated cytokeratin alone cannot definitively say that the patient is suffering from a certain disease. It is recommended to go to the hospital for further examination, preferably a CT scan of the chest and pelvis to determine the cause of the elevated cytokeratin. Other tumor markers should also be monitored. If the cytokeratin test result is abnormal, go to the hospital immediately to identify the cause of the disease. Do not delay, as this may delay the treatment of the disease and jeopardize your life.