CAMRT Radiography Practice Exam

What two statistical methods are commonly used in bone densitometry studies?

1. T-score and Z-score

2. X-score and Y-score

3. A-score and B-score

4. P-score and Q-score

The correct answer is: T-score and Z-score

In bone densitometry studies, the T-score and Z-score are the two statistical methods commonly used to assess bone health. The T-score compares an individual's bone mineral density (BMD) to the average peak bone mass of a healthy young adult of the same sex. This score is crucial for diagnosing osteoporosis and determining fracture risk. A score of -1 or higher is considered normal, whereas scores between -1 and -2.5 indicate low bone mass (osteopenia), and scores of -2.5 or lower indicate osteoporosis. The Z-score, on the other hand, compares the individual’s BMD to that of age-matched peers, providing insight into whether the low bone density is due to aging or another underlying condition. This can help inform clinical decision-making, especially in younger populations or when there are concerns about secondary causes of bone loss. The other options, which include various combinations of scores that are not standard in the field of bone densitometry, do not represent recognized methods for assessing bone density, and therefore are less relevant in the context of clinical practice or research. This makes the T-score and Z-score the preferred choices for evaluating and interpreting bone health data effectively.