Which of the following represents a common measurement unit used in bone densitometry?

• A. g/cm²
• B. mL/kg
• C. kg/m²
• D. mg/dL

Answer: (A)

In bone densitometry, the most common measurement unit used to assess bone mineral density (BMD) is grams per square centimeter (g/cm²). This unit reflects the amount of mineral content in bone per surface area and provides essential information regarding bone strength and density, which is crucial for evaluating the risk of osteoporosis and related fractures.

The use of g/cm² allows clinicians to make standard comparisons across different patients and different measurement techniques, facilitating consistent tracking of bone density changes over time. The results expressed in this unit can be directly compared to reference values to determine whether an individual has normal bone density, low bone density, or osteoporosis.

Other options like mL/kg, kg/m², and mg/dL are not standard units utilized in the context of bone densitometry measurements. Each of these alternatives pertains to different aspects of medical or laboratory measurements—such as fluid density or metabolic rate—rather than the specific density of bone mineral, which is the primary focus in bone densitometry assessments.