The diagnosis of bladder tumors by concentration of epithelial cells in the urine and by the help of the fluorescence property of tetracycline.

Positive results were obtained in epithelial concentrations when tetracycline was given to 50 patients with bladder tumors. The diagnosis of bladder tumors with epithelial concentration is especially helpful in patients with hematuria and pyuria. With this technique many epithelial cells radiate a bright yellow fluorescence.