Dual-energy X-ray absorptiometry, or a DEXA scan, is recognized for its role in measuring bone density to assess skeletal health. Beyond this primary function, the technology also serves as a precise tool for quantifying body composition. It can provide metrics on fat mass, lean mass, and the regional distribution of these tissues throughout the body. This capability makes it a useful instrument for individuals in wellness and fitness programs who seek to track progress and for longitudinal monitoring of body changes over time.
What Is a DEXA Scan?
A DEXA scan is an imaging test that uses a very low dose of X-ray energy to produce pictures of the inside of the body. Two different X-ray beams with distinct energy levels are aimed at the patient’s body. This technology is capable of distinguishing between bone mass and soft tissue mass.
This process provides highly accurate, segmented body composition metrics. A report may display the total body fat percentage alongside the specific mass of fat and lean tissue in various regions, such as the arms, legs, and trunk. Some systems can provide an estimation of visceral adipose tissue, the fat surrounding the internal organs. The availability of these specific reports and the level of detail can vary by imaging facility and the software they employ.
Who Should Receive One?
The scan can be helpful for individuals monitoring body composition changes that occur after making significant lifestyle shifts, offering objective data to complement other measures of progress. For older adults, a DEXA scan provides valuable information on bone health, a common concern associated with aging. Screening guidelines for bone density assessment may differ based on age, sex, and specific risk factors. A discussion with a healthcare provider or imaging specialist can help determine appropriate timing and frequency for any type of DEXA scan.
What Does the Process Entail?
Preparing for a DEXA scan is straightforward. Imaging centers typically provide pre-visit instructions. These often include pausing calcium supplements for 24 hours before the appointment and avoiding clothing with metal zippers. Patients may also be asked to remove jewelry. If a person has recently undergone a medical study involving a contrast agent, a waiting period may be necessary before a DEXA scan can be performed.
The procedure is non-invasive and requires the individual to lie still on a table. An arm scanner passes slowly overhead, capturing the images. After the scan, the results are compiled into a report containing the images. These outputs are then available for review with a qualified professional. The specific body composition metrics provided will depend on the software and protocols used by the imaging center.
Confer With an Imaging Specialist
Periodic DEXA body composition reports can provide valuable data to support goal setting and program adjustments. For those interested in obtaining a detailed analysis, the first step is to locate a qualified imaging center. You can contact the center directly to discuss service availability, learn about the necessary preparation, and schedule an appointment. A specialist at the facility can answer questions about the procedure and what you can expect from the results.
