For complicated urinary tract disease, at which times should urine culture be performed?

• A. One week after treatment has started and one week after treatment has stopped
• B. Only at initial presentation
• C. Only after finishing therapy
• D. Only if fever is present

Answer: (A)

In complicated urinary tract disease, you want to confirm both that the infection is responding to treatment and that it is fully eradicated, because these cases are prone to persistent infection or relapse due to factors like structural abnormalities, stones, or catheters.

A urine culture one week after starting therapy lets you assess early microbiologic response and adjust therapy if needed while the patient is still on treatment. A second culture about one week after completing therapy verifies that the infection has been cleared and detects relapse or persistence that could require further management.

Relying only on initial presentation misses failures that emerge during or after treatment, and waiting only until after finishing therapy misses those early non-responders. Fever alone isn’t a reliable trigger for cultures in complicated UTIs, since infection can be present without fever and not all fevers reflect treatment failure.

So this timing—one week after starting and one week after finishing therapy—best ensures both an adequate response and a confirmed cure.