What is the purpose of urine culture collection technique, and how can improper collection affect results?

• A. To identify the causative organism and guide antibiotic therapy; improper collection can cause contamination and false results
• B. To estimate urine color
• C. To determine hydration status
• D. To detect stones via imaging

Answer: (A)

The purpose of obtaining a urine culture is to identify the organism causing a urinary tract infection and to guide which antibiotic will be most effective. This relies on collecting a truly representative sample, usually with a clean-catch midstream technique to limit contamination from skin and genital flora. If the collection is improper, contaminants from the urethral opening or surrounding skin can grow in the culture, producing mixed growth or organisms that aren’t causing the infection. That contamination can lead to false impressions about which pathogen is present or its antibiotic susceptibility, potentially resulting in inappropriate treatment or missed organisms. Proper technique and timely handling help ensure the culture accurately reflects the bladder contents and informs appropriate therapy.