What laboratory test would reveal pyuria in a case of epididymitis?

In the context of epididymitis, a urine analysis is particularly relevant because it can identify the presence of pyuria, which is defined as an excess of white blood cells in the urine. Pyuria often indicates an underlying infection or inflammation, which aligns with the typical etiology of epididymitis, frequently caused by sexually transmitted infections or urinary tract infections.

During the urine analysis, the examination of the urine can reveal the presence of white blood cells, bacteria, and possibly other cellular components that point toward an infectious process in the urinary tract or surrounding areas. This provides critical information for diagnosis and subsequent management of epididymitis.

Other choices do not provide such specific information regarding urinary inflammation or infection. A complete blood count could show signs of systemic infection, but it would not specifically demonstrate pyuria. Imaging studies like a CT scan or X-ray of the pelvis do not evaluate urine directly, and while they can be useful in assessing anatomical abnormalities, they do not indicate the presence of pyuria. Thus, the urine analysis is the most direct and diagnostic test for revealing pyuria in this scenario.