Z-score

這是什麼

A Z-score compares BMD with people closer to the same age, and is preferred over T-score in younger adults and children.^[1,2]

為什麼重要

It helps flag whether bone density is lower than expected for age, but it is not a diagnosis by itself.^[2,3]

它會影響哪些判斷

• ISCD defines Z-score -2.0 or lower as below the expected range for age, and above -2.0 as within the expected range for age.^[2]
• In children and adolescents, osteoporosis should not be diagnosed from densitometry alone.^[3]

解讀陷阱

• Z-score needs population and growth context, especially in children, chronic disease, delayed puberty, or small body size.^[3]

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