Body composition analysis is the process of assessing the content of fat, muscle, and bone in the body. Body fat can be measured in a variety of ways, including using calipers to measure subcutaneous fat (fat stored beneath the skin), special scales, and hydrostatic weighing. While BMI is commonly used to determine whether a person is underweight, overweight, or obese, it is not an accurate measure of fat content in the body or risk of obesity-related disease. To get the most accurate and complete information, dual-energy X-ray absorptiometry body composition analysis, better known as a DXA BCA, is the gold standard.