DEXA Scan for Longevity: The Complete Guide
Bone density, visceral fat, and lean mass — what the scan tells you that a scale cannot
Dual-energy X-ray absorptiometry is the clinical standard for bone mineral density and a useful whole-body composition test (lean mass, fat, visceral adipose). Attia and sports-medicine clinics use it as a periodic snapshot. This guide covers what to book, how to prepare, how often to repeat, and what to do with the PDF.
Frequency
Every 1–2 years (or per clinician)
Duration
Single 10–20 minute scan
Level
Beginner
Key Takeaways
- 1DEXA is two tests in one: osteoporosis screening (hips/spine) and optional whole-body composition
- 2Visceral fat and appendicular lean mass beat BMI for risk conversations
- 3Repeat every 1–2 years if you are changing training or on bone meds — not every month
- 4Home scales and smart rings estimate; DEXA calibrates the story
Who this is for
- ·Anyone over 50, or earlier with fracture/family risk
- ·Lifters who want lean-mass proof, not just scale weight
- ·People whose BMI is ‘fine’ and waist is not
What DEXA Measures
Strong EvidenceClinical bone DEXA reports T-scores and Z-scores at lumbar spine and hip — the osteoporosis numbers that change medication decisions.
Whole-body DEXA (often at sports or ‘longevity’ centers) adds regional fat, lean mass, and an estimate of visceral adipose tissue. That is the scan biohackers mean when they say ‘get a DEXA.’
It is low radiation compared with CT. Still a medical X-ray — follow pregnancy rules.
How to Book and Prepare
Moderate EvidenceInsurance often covers indicated bone-density screening (age, sex, fracture, steroid use). Whole-body composition is frequently cash-pay ($50–150).
Same time of day, hydrated but not water-logged, no calcium tablet that morning if instructed, same clothes. Do not compare a Monday after a salt binge to a Friday after a hard cut.
Ask whether you are getting hip/spine, whole body, or both. Bring prior files for the same machine if possible — different brands disagree.
What to Do With the Result
Moderate EvidenceLow bone density: see the bone-density guide — lift, vitamin D/K2 as indicated, protein, fall prevention, endocrinology if T-scores qualify.
High visceral fat: Zone 2, protein, sleep, waist trend, ApoB and glucose context. A scale can still go the wrong way while composition improves.
Low lean mass: progressive lifting and creatine. Grip strength and sit-to-stand are free corroboration.
When You Cannot Get a DEXA
Waist circumference, progress photos, strength logs, and a decent home scale are enough to start. Withings-style scales estimate; treat them as trends. InBody and consumer BIA are hydration-sensitive.
Do not skip indicated clinical bone screening because a gym scale said you were ‘12% body fat.’
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Sources
Key references cited in this guide. Links open the original publication or abstract.
- Official positions of the ISCD on body compositionJ Clin Densitom, 2013
- DEXA for osteoporosis diagnosis — clinical useNat Rev Endocrinol, 2014
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