BioConst生物常量

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Medical Wiki

BMD

Bone mineral density: a measurement result, not a standalone diagnosis.

What it is

BMD estimates how much mineral is present in a measured bone area. DXA reports often use BMD to calculate T-scores or Z-scores.[1,2]

Why it matters

Lower BMD can be associated with higher fracture risk, but bone quality, falls, disease context, and prior fractures also matter.[1]

What it affects

  • A low BMD result can support low bone mass or osteoporosis classification in the right adult population.[1,3]
  • High density is not automatically strong bone; osteopetrosis is one counterexample.[4]

Interpretation traps

  • Do not read BMD without age, sex, skeletal site, instrument, fracture history, and clinical context.[3]

Related conditions

Osteoporosis and fragility fractureLow bone mass / osteopeniaOsteogenesis imperfecta and heritable fragilityOsteopetrosis / high-density brittle bone