Overview:
This module is focused on understanding the significance of Body Composition Testing, particularly the use of the Dual-Energy X-ray Absorptiometry test (DEXA or DXA). This tool is particularly helpful in determining lean mass, fat mass, and bone mineral density at a reasonable cost.
As weight loss is often accompanied by lean muscle loss, a DXA can aid patients and clinicians in making changes to protein intake and resistance exercise. DXA also helps with differentiating between subcutaneous and visceral fat which has important implications for metabolic health.
Topic Summary:
- DXA is helpful in assessing risks for metabolic health, that extend beyond the information provided by scales or laboratory tests.
- DXA is a reliable method for measuring lean mass, fat mass, and bone mineral density.
- A DXA scan can be useful for comparing subcutaneous (healthy) fat and visceral (unhealthy, or inflammatory) fat.
- Periodic monitoring of Appendicular Lean Muscle (ALM) through DXA can help manage protein intake and exercise regimes for optimal results.
- A DEXA scan requires an order from a licensed healthcare provider and may not be covered by health insurance, but is generally inexpensive (av. ~$60).
