WHO Criteria to Interpret Bone Densitometry in Women

Normal. A value for BMD or bone mineral content (BMC) within 1 SD of the young adult reference mean.

Low Bone Mass (Osteopenia). A value for BMD or BMC more than 1 SD below the young adult mean but less than 2.5 SD below this value

Osteoporosis. A value for BMD or BMC 2.5 SD or more below the young adult mean.

Severe Osteoporosis (Established Osteoporosis). A value for BMD or BMC 2.5 SD or more below the young adult mean in the presence of one or more fragility fractures.

Reference:

World Health Organization, Karis et al. Osteo. Intl. WHO Library Cataloguing in Publication Data.1994 Vol 4, págs: 368-381.

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