Weight Loss & Metabolic Health
What Is Body Composition Testing?
Last reviewed: May 2026 · Haute MD Editorial Team
Body composition testing measures the proportions of fat, muscle, bone, and water in the body — providing far more meaningful information than weight or BMI alone. The most accurate methods are DEXA scan, MRI, and hydrostatic weighing; common in-office methods include bioelectrical impedance (BIA), InBody, and skinfold calipers. Most weight-loss programs benefit from baseline and follow-up body composition.
Why body composition matters
Two people at the same weight can have dramatically different health risks based on fat-to-muscle ratio and where fat is stored (visceral vs. subcutaneous). Body composition tracks the quality of weight loss — fat loss vs. muscle loss.
Methods compared
DEXA scan: gold standard for accuracy (±1-2%), $100-$250 per scan. InBody/BIA: convenient, less accurate but useful for tracking trends ($30-$100 or free at gyms). Skinfold calipers: cheap but operator-dependent. MRI: most accurate but expensive.
How often to test
Every 3 to 6 months during active weight management. More frequent testing has diminishing returns and can amplify normal fluctuations.
Frequently Asked Questions
Is BMI useless?
Not useless, but limited — it doesn't distinguish fat from muscle or measure visceral fat.
Where can I get a DEXA scan?
Many obesity medicine clinics, longevity practices, and some imaging centers offer them.
Are home body composition scales accurate?
Useful for tracking trends but not absolute accuracy. Same scale, same conditions, same time of day.
How much muscle should I have?
Varies by age and sex. Most adults benefit from being above the 50th percentile for their demographic.
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