In asthma self-management, what does personal best refer to?

• A. The highest PEF reading ever achieved in life
• B. The lowest PEF reading ever achieved
• C. The best PEF reading achieved during stable control
• D. The average PEF reading of the past month

Answer: (C)

Personal best refers to the best PEF reading achieved during a period of stable, well-controlled asthma. This creates your own personalized baseline so you can gauge any future readings against what is typical for you. It matters because it accounts for individual lung function and daily variations, giving a meaningful trigger point for noticing worsening control. It’s not the highest ever, not the lowest, and not an average over the past month—those don’t provide the same reliable reference for detecting problems. By comparing current PEF to this personal best, you can tell when an attack may be developing and follow your action plan.