Men are much less likely to develop UTI than women, but when it does occur, often other underlying causes, such as kidney stones or prostate enlargement, are present. Diagnosis of UTI The first step in diagnosis is often a simple urine routine, including the amount of bacteria and also an abnormal red and white blood cell count. A test strip test can provide a quick result, and doctors sometimes send urine for culture to determine the type of bacteria. Home test kits can aid in diagnosis but are not particularly accurate, and it is important to carefully inform your doctor of the results and symptoms at the time of your visit.