A bone density is a fast and painless test. This test uses special X-rays to measure how many grams of calcium and other bone minerals collectively known as bone mineral content are packed into a segment of bone. The higher your mineral content, the denser your bones are. And the denser your bones, the stronger they are and the less likely they are to break. Doctors use a bone density test to determine if you have, or are at risk of, osteoporosis.
Bone density tests are not the same as bone scans. Bone scans require an injection beforehand and are usually used to detect fractures, cancer, infections and other abnormalities in the bone.