What is considered a normal T-score range for bone density?

• A. -1.0 to +1.0
• B. -2.0 to -1.0
• C. 0 to -2.5
• D. Above +1.0

Answer: (A)

A normal T-score range for bone density is defined as a score that falls between -1.0 and +1.0. The T-score is a comparison of an individual's bone mineral density (BMD) to that of a healthy young adult of the same sex. A T-score of -1.0 means the individual's BMD is one standard deviation below the young adult mean, while a score of +1.0 indicates the individual's BMD is one standard deviation above the mean. Scores within this range suggest that the bone density is considered to be normal, indicating a lower risk of fractures and other complications related to weak bones.

The other ranges provided do not align with the accepted definitions for normal BMD. For instance, a score from -2.0 to -1.0 indicates a mild decrease in bone density, categorizing the individual as having osteopenia, which raises concerns about increased fracture risk. A T-score from 0 to -2.5 is likewise indicative of a higher risk for osteoporosis as it starts to overlap with categories that suggest significant bone density loss. A T-score above +1.0 indicates higher than average bone density, which, while not necessarily harmful, does not represent the normal range defined in clinical practice