What is the best indicator of the effectiveness of antibiotic therapy?

What is the best indicator of the effectiveness of antibiotic therapy?

• A. Hemoglobin level
• B. White blood cell count
• C. Platelet count
• D. C-reactive protein level

Answer: (B)

Monitoring how well antibiotics are working hinges on the body’s immune response to infection. White blood cell count is the best indicator because leukocytosis is a common reaction to bacterial infection, and as the infection resolves with treatment, the WBC count typically decreases toward normal. A downward or normalizing trend suggests improvement and effective therapy, while a persistently high or rising count can indicate ongoing infection or treatment failure. Hemoglobin and platelets don’t reflect acute infection directly, and C-reactive protein, though useful, is a nonspecific inflammatory marker that can be influenced by many factors and may not track infection resolution as precisely as the WBC count.

Monitoring how well antibiotics are working hinges on the body’s immune response to infection. White blood cell count is the best indicator because leukocytosis is a common reaction to bacterial infection, and as the infection resolves with treatment, the WBC count typically decreases toward normal. A downward or normalizing trend suggests improvement and effective therapy, while a persistently high or rising count can indicate ongoing infection or treatment failure. Hemoglobin and platelets don’t reflect acute infection directly, and C-reactive protein, though useful, is a nonspecific inflammatory marker that can be influenced by many factors and may not track infection resolution as precisely as the WBC count.