Bone age norms are matched to which factors?

• A. Age And Height
• B. Age And Sex
• C. Sex And Race
• D. Height And BMI

Answer: (B)

Bone age norms are matched to age and sex because skeletal maturation proceeds along different timelines for boys and girls and changes as children grow. When evaluating a left hand and wrist radiograph, clinicians compare the developing bones to reference standards that are organized by both chronological age and sex. This pairing allows for an accurate sense of whether a child’s bone development is ahead, behind, or on track for their specific age and gender, which is crucial for diagnosing growth disorders or endocrine issues.

Height or BMI aren’t used to define these normative references because they describe body size or composition, not the timing of bone development. Race can influence some datasets, but the standard approach that informs most bone age assessments focuses primarily on age and sex.