What diagnostic test is most commonly used to confirm a urinary tract infection (UTI)?

The urinalysis is the most commonly used diagnostic test to confirm a urinary tract infection (UTI) because it provides valuable information about the presence of bacteria, white blood cells, and nitrites in the urine. These indicators are key in diagnosing UTIs, as they suggest an infection is present. During a urinalysis, urine is typically examined for these substances, making it a quick and effective tool for healthcare providers to assess urinary health.

In contrast, a CT abdomen/pelvis, while useful for assessing complications or alternative diagnoses, is not routinely used for initial UTI diagnosis due to its higher cost, radiation exposure, and the fact that it is not focused specifically on detecting a simple UTI. An ultrasound of the pelvis may help in assessing structural abnormalities or complications in cases of recurrent UTIs but does not directly diagnose an infection. Endoscopy is an invasive procedure and is not typically employed unless there are specific indications, such as recurrent UTIs due to anatomical abnormalities or other concerns that have not responded to standard treatment.