The urine culture and sensitivity (22 drugs) test is used to identify the yeast or bacteria causing the infection and to diagnose a urinary tract infection. The test may be done in conjunction with susceptibility testing to find out which antibiotics will inhibit the growth of the bacteria which will be causing infection. Urine is the fluid which contains wastes and water that is produced by the kidneys. The kidneys filter the waste out of the blood and produce urine which travels through tubes called ureters to the bladder which is then eliminated through the urethra. People suffering from kidney disease or other severe diseases that are affecting the kidneys like kidney stones, diabetes or weakened immune system are more prone to complicated, frequent or repeated urinary tract infection.