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DEXA Scans for Body Composition
Dual-Energy X-ray Absorptiometry (DEXA) is the gold standard for measuring bone mineral density, visceral adipose tissue (VAT), and lean muscle mass asymmetry.
Why BMI Fails
BMI cannot distinguish between a highly muscled athlete and a metabolically unhealthy person with high visceral fat and low muscle mass (sarcopenic obesity).
| Metric | Clinical Focus | Longevity Target |
|---|---|---|
| Visceral Adipose Tissue | Mass (g) | < 300g |
| ALMI (Appendicular Lean Mass Index) | kg/m² | > 75th percentile for age |
Common Mistakes
- Hydration Changes: Scanning dehydrated vs. hydrated will skew lean mass results. Standardize your water intake and fast prior to the scan.
Frequently Asked Questions
Q: Is the radiation safe?
A: A DEXA scan exposes you to less radiation than a cross-country flight.