If an initial DEXA screen is abnormal, how often should it be repeated?

• A. Every 6 months
• B. Every 2 years
• C. Every 1 year
• D. Every 3 years

Answer: (B)

Bone density changes slowly and there’s inherent variability in DEXA measurements. After an abnormal initial screen, rechecking around two years later provides enough time for true changes in bone density to become apparent (whether progression or improvement due to therapy) while avoiding unnecessary testing or noise from measurement error. Shorter intervals (like 6–12 months) often don’t reveal meaningful change and longer intervals (beyond 3 years) risk missing progression. Therefore, repeating about every two years is the most appropriate approach. If there are high-risk features or treatment changes, clinicians may adjust the interval, but the standard recommendation is approximately every two years.