Which statement about bone density monitoring in long-term PN is correct?

Which statement about bone density monitoring in long-term PN is correct?

• A. DEXA should be performed every 1-3 years.
• B. DEXA is not recommended.
• C. DEXA should be done monthly.
• D. DEXA is unnecessary.

Answer: (A)

Bone density monitoring with DEXA is used in long-term PN because patients are at risk for metabolic bone disease due to mineral imbalances, reduced activity, and illness-related factors. DEXA provides a reliable, low-radiation measure of bone mineral density at key sites like the lumbar spine and hip, helping detect osteopenia or osteoporosis early and guiding therapy (calcium, phosphate, vitamin D, PN adjustments). Bone changes progress slowly, so repeating DEXA every 1-3 years strikes a balance between catching meaningful declines and avoiding unnecessary testing. Monthly scans would not reflect real short-term changes and aren’t needed, while stating that DEXA isn’t recommended or unnecessary overlooks the established risk of bone loss in this population. Baseline DEXA at PN initiation with follow-up within the 1-3 year window, tailored to individual risk factors, is a practical approach.

Bone density monitoring with DEXA is used in long-term PN because patients are at risk for metabolic bone disease due to mineral imbalances, reduced activity, and illness-related factors. DEXA provides a reliable, low-radiation measure of bone mineral density at key sites like the lumbar spine and hip, helping detect osteopenia or osteoporosis early and guiding therapy (calcium, phosphate, vitamin D, PN adjustments). Bone changes progress slowly, so repeating DEXA every 1-3 years strikes a balance between catching meaningful declines and avoiding unnecessary testing. Monthly scans would not reflect real short-term changes and aren’t needed, while stating that DEXA isn’t recommended or unnecessary overlooks the established risk of bone loss in this population. Baseline DEXA at PN initiation with follow-up within the 1-3 year window, tailored to individual risk factors, is a practical approach.