According to WHO, what T-score is classified as normal?

• A. -2.5 SD or lower
• B. -1 to -2.5 SD
• C. -1 SD or better
• D. -1 to 0 SD

Answer: (C)

The World Health Organization (WHO) defines a normal T-score in bone densitometry as being -1 standard deviation (SD) or better. This means that a T-score of -1 or higher indicates that the bone density is within the normal range, reflecting a lower risk for fracture compared to individuals with lower T-scores, who may have reduced bone density.

A T-score that falls between -1 and -2.5 SD indicates "low bone mass" or osteopenia, which suggests a higher risk for developing osteoporosis but is not classified as normal. Scores lower than -2.5 SD indicate osteoporosis, which entails an even greater risk of fractures. Thus, understanding the significance of T-scores is crucial in assessing bone health and determining the appropriate interventions when needed.