Bone density is a measurement of the concentration in
bone of minerals (mostly calcium and phosphate) that are vital for strong
bones. A high bone density means above-average amounts of calcium
and phosphates in the bones, while a below-normal bone density can
mean a loss of bone mass, possibly from osteopenia or osteoporosis.
Anne C. Poinier, MD - Internal Medicine & Carla J. Herman, MD, MPH - Geriatric Medicine