Osteoporosis is defined by a BMD ≤ 2.5 SD below the young adult reference population. Standard dual-energy X-ray absorptiometry (DXA) scans for osteoporosis involve the femoral neck and lumbar spine, but alternative sites like the one-third radius (1/3 R) are only used when these sites are inaccessible. This study assessed the correlation and level of agreement between BMD at the 1/3 R, femoral neck, and lumbar spine to evaluate its diagnostic utility. Data from 43,801 patients referred for DXA scans in northwest England were analysed. Of these, 437 underwent 1/3 R scans. Demographic comparisons between patients with and without forearm scans were conducted. The primary analysis included patients with scans at the 1/3 R, lumbar spine, and bilateral femoral regions
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