Definition
Dual energy X-ray absorptiometry (DEXA) is an imaging test that uses small doses of X-ray beams to measure bone mineral density and body composition.
Explanation
- DEXA scans provide detailed body composition analysis including fat mass, lean mass, bone mineral density, and visceral fat.
- The test uses two X-ray beams with differing energy levels aimed at your body as you lie still on a table. It lasts 10-20 minutes.
- DEXA scans have minimal radiation exposure, comparable to a short flight. They’re considered one of the most accurate methods of body fat testing.
- The results help identify osteoporosis risk and track changes in muscle, fat, and bone density over time with diet and exercise.
Examples
- Getting a DEXA scan to track your body fat percentage changes during a 12-week diet
- Checking bone mineral density and lean mass pre- and post-season as an athlete
Related Terms
- Body fat percentage, lean mass, visceral fat, bone density
Common Questions
- How often can I get a DEXA scan? Every 1-2 years to minimize radiation exposure.
- Is a DEXA scan necessary? No, but it provides more accuracy than scales and calipers for tracking progress.
Do Not Confuse With
- Hydrostatic weighing – Body fat testing method based on water displacement
- MRI & CT scans – Similar imaging technology but used to diagnose medical conditions
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