When is a follow-up DXA recommended for a patient diagnosed with osteoporosis?

• A. Annually
• B. Every six months
• C. In two years
• D. Immediately after treatment

Answer: (C)

A follow-up dual-energy X-ray absorptiometry (DXA) scan is recommended in two years for a patient diagnosed with osteoporosis. This timing allows for an adequate assessment of the effectiveness of any treatment initiated and helps to monitor changes in bone mineral density (BMD) over time. Osteoporosis management typically involves medications that aim to improve bone density, and changes may take time to become noticeable on imaging.

Conducting a follow-up DXA too frequently, such as annually or every six months, may not provide significant new information regarding a patient's condition because bone density changes occur relatively slowly, especially in response to treatment. Following up immediately after treatment would also not be advised, as it would be too soon to assess any treatment effects on bone density. Therefore, the two-year interval strikes a balance between monitoring progress and allowing enough time for treatment to influence bone health.