DexaME Frequently Asked Questions (FAQ)
What is a DexaME scan?
Why body composition?
Most people are used to stepping on a scale at every visit to a doctor’s office, but monitoring weight alone, while helpful, is at best a crude and an imprecise way to assess their health. Today’s body composition measurement tools provide far more complete and precise information.
How does body composition work?
The DEXA bone densitometer uses small amounts of X-ray to produce the total body image. The X-ray is composed of two energy levels that are absorbed differently by bone, lean and fat tissues. These differences in absorption are used to determine bone mineral density (BMD) and body composition values. A computer software application assists in determining the amount of bone, lean and fat tissues across the whole body and in specific regions.
Why do the body composition using DEXA?
Body composition measurements with dual-energy X-ray absorptiometry (DEXA) can, with accuracy and precision, look beyond weight and traditional body mass index (BMI) to determine and monitor the distribution of body fat, bone, and lean muscle mass. Body composition DEXA exams can provide useful regional and total body information to healthcare professionals in their management of conditions where the condition itself, or its treatment, can affect the relative amounts of fat and lean tissue.
Is there radiation from the DEXA body composition scan?
The X-ray dose from a typical body composition scan is comparable to THREE hours of background radiation. In fact, the radiation is less than that on a one-way flight from Toronto to New York City. The X-ray exposure from a DEXA scan is a HUNDRED TIMES LESS than a routine chest X-ray.
During the test
The DXA bone densitometer examination table is padded and comfortable.
- Your name, age, height, weight, and ethnicity are entered into the computer before your exam. This information is used to compare your results to a normal reference group.
- You are then asked to lie on your back and remain in your normal clothing, in most cases. Belt buckles, metal or thick plastic buttons and metal jewelry need to be removed from the region being examined.
- The operator positions your arms and legs.
- During the exam, which is painless and typically takes less than 10 minutes, you lie still and breath normally.
Your body composition results
Your total body composition is calculated for various regions (arms, legs, trunk, total). Results are displayed for percent body fat, fat mass, and lean muscle mass. Your bone mineral density (BMD) may also be calculated, providing additional information about your bone health. Over time, these results can be monitored to better understand how changes in diet, lifestyle, exercise, or other interventions are influencing your body composition.