Best DEXA Scans in 2026

DEXA is widely used as a reference method, but most studies comparing it with the four-compartment model, the reference standard, found significant differences (Toombs et al., Obesity 2012). Its strength is repeatability: in athletes scanned twice on a fan-beam scanner, percent body fat varied by 2.5% (Bilsborough et al., J Sports Sci 2014). DEXA also reports fat and lean mass for the arms, legs, and trunk separately, which bathroom scales do not.

A whole-body DEXA scan uses a very small X-ray dose. Measured effective doses for an adult whole-body scan on Hologic Discovery scanners were 4.2 to 8.4 microsieverts, depending on the model (Blake et al., Bone 2006). The exact dose depends on the scanner and scan mode, so ask the facility if you plan frequent scans.

Arrive hydrated but avoid eating a large meal within 2 hours of your scan, as food in your digestive tract can slightly affect readings. Wear athletic clothing without metal zippers or underwire. Remove jewelry and watches. For consistent tracking, try to scan at the same time of day under similar conditions each time.

Yes, DEXA measures bone mineral density (BMD) and is the standard diagnostic tool for osteoporosis. Your report will show T-scores comparing your bone density to healthy young adults. Scores above -1.0 are normal, -1.0 to -2.5 indicate osteopenia (low bone mass), and below -2.5 indicates osteoporosis. Many providers focus on body composition, so confirm bone density is included if that's your goal.

For body composition tracking, every 8-12 weeks provides meaningful data without excessive cost. More frequent scanning rarely shows statistically significant changes. For bone density monitoring, annual scans are typical unless you're being treated for osteoporosis, in which case your doctor may recommend every 6 months to track treatment response.