NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What does a DEXA scan measure?

  1. BMI

  2. BMD

  3. Blood calcium levels

  4. Bone density manually

The correct answer is: BMD

A DEXA scan measures bone mineral density (BMD). This is an important measurement used to diagnose osteoporosis and assess the risk of fractures. A DEXA scan uses low-energy X-rays to evaluate bone density, typically in the spine, hip, or forearm. This test is considered the gold standard for assessing bone health and is crucial in determining the need for treatment or monitoring the effectiveness of osteoporosis medications. The other options are incorrect: A. BMI (Body Mass Index) is a calculation based on a person's height and weight, used to estimate whether a person has a healthy body weight. C. Blood calcium levels are not directly measured by a DEXA scan. Calcium levels in the blood are usually tested through a blood sample to assess various medical conditions. D. Bone density cannot be manually measured accurately without the use of specialized equipment like a DEXA scan.