Body composition analysis (DEXA)
A low-dose X-ray scan distinguishing fat mass, lean muscle mass, and bone mineral density, used to track change over time.
What it is & how it works
Dual-Energy X-ray Absorptiometry (DEXA) is an imaging-based scan that distinguishes fat mass, lean (muscle) mass, and bone mineral density using two low-dose X-ray beams of differing energy.
How it's done
A low-dose X-ray scan lasting roughly 10–20 minutes, requiring no special preparation beyond removing metal objects, performed by a radiology technician and reviewed by a physician against baseline or prior scans to track change over time.
Conditions it treats
Why Unfold Longevity
Used to establish an objective baseline and track change over time as part of an individualized plan, rather than a single-visit number reported without context.
Evidence & safety
Used to establish baseline and track change over time; low radiation dose, standard clinical methodology.
Related questions
It separates total weight into fat mass, lean (muscle) mass, and bone mineral density using two low-dose X-ray beams, rather than a single combined number. This lets change in muscle or fat be tracked over time independent of overall weight.
No fasting is required; wear loose clothing without metal zippers, buttons, or belts, and avoid calcium supplements for about 24 hours beforehand if advised. The scan itself takes roughly 10–20 minutes and involves a very low radiation dose, well below a standard chest X-ray.