Final answer:
Suprapubic aspiration is used to collect a sterile urine sample for accurate diagnosis of urinary tract infections, particularly when other collection methods are not possible or reliable.
Step-by-step explanation:
The suprapubic aspiration method is utilized in medical scenarios, particularly when it is necessary to collect a urine sample that is not contaminated by the flora of the lower urinary tract. This procedure is often performed when there is a need for a sterile urine sample to diagnose a urinary tract infection, especially in cases where other collection methods are not possible or reliable, such as in infants or patients who are unable to provide a clean-catch sample. The method involves inserting a needle directly into the bladder through the abdominal wall and is considered more invasive than other urine collection methods, but it provides a high level of accuracy in diagnosing urinary infections.