A DXA scan is created by scanning the whole body with very low dose X rays. The amount of radiation is less than a single chest X ray and it is not a CT or MRI scan. It is performed at a radiology clinic. A lot of information is collected by a single scan, it is corrected for age and sex and a report then generated. The results from that patient are presented in a written report. There is a graphical presentation of bone, muscle and fat.
DXA scans can reliably evaluate body composition. Simply they measure muscle mass, bone mass and body fat with an additional measurement of visceral (abdominal) fat. These measurements are very accurate. Repeat scans can serve to evaluate progression of disease or response to treatment.
The two most valuable measurements are of skeletal mass and body fat.
Sarcopenia is the name given to loss of muscle mass and it commonly occurs in ageing. In obese patients it is difficult to recognise muscle wasting but a body composition scan will enable an earlier diagnosis.
The degree of obesity can be established; high levels of body fat correlate well with increased risk of many diseases. Visceral fat, an indicator of inflammatory disease, can be measured and quantified.
For a more detailed explanation go to: https://ketogenic-life.com.au/download/advanced-body-composition-reporting-and-interpretation and download the document.