Also known as CK(Cytokeratin) 19 Immunohistochemistry Biopsy Tissue test. The test is used to detect any kind of cancerous tissues or cells in the Bladder. It is also used to test Cholangiocarcinoma and any ailment of epithelial origin. The test is performed before the confirmation of the presence of cancerous tissues or cells, during treatment and after the treatment is administered. The testing method is same for all age groups and is a unisex testing method. A simple biopsy is to be done on Bladder cells with the help or radiology or ultrasound technique.