Bone Density Scan ( DEXA )

A bone density scan, also known as Dual-Energy X-ray Absorptiometry (DEXA or DXA scan), is a non-invasive imaging test that measures bone mineral density (BMD) to assess bone strength and detect osteoporosis or risk of fractures.

This test is commonly recommended for individuals at risk of bone loss due to aging, hormonal changes, or certain medical conditions. It helps doctors determine if preventive or corrective treatment is needed to maintain bone health.

 

The DEXA scan is the gold standard for evaluating bone density. The procedure:

• Uses low-dose X-rays to measure calcium and mineral content in bones.
• Focuses on key areas like the spine, hips, and wrists, where fractures are most common.
• Is quick, painless, and takes about 10-20 minutes.

Results are provided in T-scores and Z-scores:

• T-score: Compares bone density to that of a healthy young adult.
  • Normal: Above -1.0
  • Osteopenia (low bone mass): Between -1.0 and -2.5
  • Osteoporosis: Below -2.5
• Z-score: Compares bone density to people of the same age, gender, and size.

Symptoms and Causes of Bone Loss

Symptoms Indicating the Need for a Bone Density Scan

• Frequent bone fractures or fractures from minor falls.
• Loss of height due to spinal compression.
• Back pain from vertebral fractures.
• Postmenopausal women at higher risk of osteoporosis.
• Family history of osteoporosis or fractures.

Causes of Bone Density Loss

• Aging – Bone loss accelerates after the age of 50.
• Menopause – Estrogen decline weakens bones.
• Lack of calcium and vitamin D – Essential for bone strength.
• Sedentary lifestyle – Lack of weight-bearing exercise reduces bone density.
• Chronic medical conditions (e.g., rheumatoid arthritis, kidney disease).
• Long-term use of steroids or medications affecting bone metabolism.

Diagnosis and Evaluation

A bone density scan is often recommended for:

• Women over 65 and men over 70 as a routine screening.
• Younger individuals with risk factors (family history, lifestyle, or medical conditions).
• People who have experienced fractures from minor injuries.
• Patients on long-term steroid medications.

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Treatment and Preventive Measures

Non-Medical Approaches to Maintain Bone Health

• Increase calcium intake (dairy, leafy greens, fortified foods).
• Ensure adequate vitamin D levels (sun exposure, supplements).
• Engage in weight-bearing exercises (walking, resistance training).
• Avoid smoking and excessive alcohol consumption.

Medical Treatment for Bone Loss

• Bisphosphonates – Reduce bone breakdown and prevent fractures.
• Hormone therapy (HRT) – Helps postmenopausal women maintain bone density.
• Selective Estrogen Receptor Modulators (SERMs) – Maintain bone mass.
• Denosumab or Teriparatide injections – Used for severe osteoporosis.
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Diagnosis and Evaluation

A bone density scan is often recommended for:

• Women over 65 and men over 70 as a routine screening.
• Younger individuals with risk factors (family history, lifestyle, or medical conditions).
• People who have experienced fractures from minor injuries.
• Patients on long-term steroid medications.

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Treatment and Preventive Measures

Non-Medical Approaches to Maintain Bone Health

• Increase calcium intake (dairy, leafy greens, fortified foods).
• Ensure adequate vitamin D levels (sun exposure, supplements).
• Engage in weight-bearing exercises (walking, resistance training).
• Avoid smoking and excessive alcohol consumption.

Medical Treatment for Bone Loss

• Bisphosphonates – Reduce bone breakdown and prevent fractures.
• Hormone therapy (HRT) – Helps postmenopausal women maintain bone density.
• Selective Estrogen Receptor Modulators (SERMs) – Maintain bone mass.
• Denosumab or Teriparatide injections – Used for severe osteoporosis.

A bone density scan is an essential diagnostic tool for evaluating bone health and preventing osteoporosis-related fractures. By identifying bone loss early, lifestyle changes and medical treatments can help maintain strong bones and prevent serious complications.