• Most accurate method available,
  with an error rate of only 1-2%
• Distinguishes between fat mass, lean mass and bone mineral content in
   the body
• Provides regional body analysis
  including lean mass vs fat mass in
  arms, legs, trunk, stomach and hips
• Comparative left and right side analysis
  of lean and fat mass in arms, legs and trunk regions to monitor for imbalances due to overuse or injury
• Muscle mass, definition, symmetry
  in body competitions
• Does not require clothing removal
• No fasting or other dietary restrictions
• You would need 162 Dexa scans to
  equal the radiation dose in a dental bitewing X-ray

         Reference: