What is the main purpose of culture and sensitivity testing in managing bacterial infections?

• A. Detect urinary pH
• B. Identify organism and determine antibiotic susceptibility
• C. Assess blood oxygen
• D. Measure RBC count

Answer: (B)

Culture and sensitivity testing centers on identifying the bacteria causing an infection and testing which antibiotics can effectively inhibit that specific organism. By growing the organism from a clinical sample and assessing its response to various antimicrobial agents, you learn both the exact pathogen and which drugs it is susceptible to. This enables targeted therapy with the most effective, often narrower-spectrum antibiotic, which improves outcomes, reduces side effects, and helps prevent the development of resistance. The other measurements—urinary pH, blood oxygen levels, and red blood cell count—tell you about different physiological or hematologic aspects and don’t identify the culprit bacteria or guide antibiotic choice.