DEXA — dual-energy X-ray absorptiometry — is considered the gold standard in body composition measurement because it does something no other non-invasive technology can: it differentiates between bone mineral content, lean soft tissue, and fat mass at every region of your body with research-grade precision. The technology works by passing two low-dose X-ray beams at different energy levels through your body. Bone, lean tissue, and fat each attenuate these beams differently, allowing the system to generate a pixel-by-pixel composition map of your entire body. The radiation dose is extremely low — approximately 1-5 microsieverts per scan, which is less than 1/10th the dose of a standard chest X-ray and roughly equivalent to the natural background radiation you absorb during a short flight. The clinical outputs that matter for longevity: total body fat percentage (measured to within 1-2% accuracy), regional fat distribution (android vs. gynoid ratio — a powerful predictor of cardiometabolic risk), visceral adipose tissue volume (VAT — quantified in grams, not estimated), appendicular lean mass index (ALM/height squared — the diagnostic criterion for sarcopenia used in the European Working Group on Sarcopenia definition), and bone mineral density (T-scores for lumbar spine and femoral neck — essential for osteoporosis screening). Peter Attia, in his framework for proactive medicine, identifies body composition as one of the pillars of longevity assessment. The reason is straightforward: muscle mass is the single largest modifiable factor in metabolic health, falls prevention, and functional independence as we age, while visceral fat is the strongest lifestyle-related driver of chronic inflammation. DEXA gives you precise, reproducible numbers for both. At Genoryx, your DEXA results are integrated with your biomarker panel and reviewed in a comprehensive physician consultation. We do not hand you a printout and send you home — we translate the data into a specific, actionable plan. Book a consultation with our longevity physician to schedule your baseline DEXA scan.