Which test would be most appropriate for a suspected urinary tract infection?

The most appropriate test for a suspected urinary tract infection (UTI) is a bacterial culture. This test specifically identifies the presence of bacteria in the urine, which is crucial for diagnosing a UTI. During the process, a urine sample is collected and cultured in a laboratory setting to allow any bacteria present to grow. Once grown, the type of bacteria can be identified, and sensitivity testing can determine the most effective antibiotic treatment. This direct approach to identifying the causative agent of the infection is essential for proper management and therapeutic decisions.

Other tests listed serve different purposes. A blood smear is used to assess blood cells and is not relevant for diagnosing UTIs. A skin prick test is typically used to identify allergies or sensitivities to specific substances, making it completely unrelated to urinary tract infections. An electrocardiogram (ECG) measures the electrical activity of the heart and is not applicable in the context of a urinary infection diagnosis.