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Introduction: Reduced bone mass density (BMD) is a frequent observation in HIV‐infected persons. Relationship between body mass index (BMI), weight, height and BMD was reported for many populations. In particular, BMI has been found to be inversely related to the risk of osteoporosis. Methods: This is a cross‐sectional, monocentric study where all HIV‐infected patients referred to first DXA scan in clinical routine during 2010–2013 were included. Osteopenia and osteoporosis were defined by T‐ score 30 kg/m[sup.2]. Statistical analysis was carried using logistic regression. Results: A total of 918 patients were included: median age 49 years (IQR, 44–55); 59.4% male; 93% Caucasian. Median anthrometric characteristics were: 68 kg (IQR, 59–78); 1.7 m (IQR, 1.6–1.75); 23.5 kg/m[sup.2] (IQR, 21.4–26.2). Underweight was found in 5%, normal weight in 61%, overweight in 26% and obesity in 8% of patients. According to T‐scores, 110 (11.2%) patients were osteoporotic and 502 (54.7%) had osteopenia. In the femoral neck area, the prevalence of osteoporosis was slightly lower (5.7%) than lumbar spine site (9.2%). Agreements between sites of T‐scores for the diagnosis of osteoporosis were 26 and 172 and 346 for osteopenia and normal BMD values, respectively. T‐scores at femoral neck or lumbar spine positively correlated with BMI (p Conclusions: Our findings indicate that almost 66% of HIV‐infected patients have subnormal bone mass. Further, as in other patient populations, in the HIV infection also low BMI is an important risk factor for osteopenia/osteoporosis. This finding highlights the compelling need for standardized screening actions, particularly in patients weighting below normal., Figure 1: Scatterplot of BMI by frmoral and lumber t‐score. Linear regression line was fitted. [Figure omitted] DOI: [...]