DEXA Scan

What is DEXA Scan?

A DEXA scan, also known as dual-energy X-ray absorptiometry, is a medical imaging test that measures bone mineral density (BMD). The DEXA scan lab test uses low-dose X-rays to assess the amount of calcium and other minerals in specific areas of the skeleton, typically the hip and spine. A detector in the scanning arm measures the X-rays passing through the body to produce an image of the scanned area.

The DEXA bone scan can help diagnose osteoporosis, assess the risk of fractures, and monitor changes in bone density over time.

The procedure is painless and non-invasive, and it usually takes about 10-20 minutes to complete. The results of the DEXA scan are reported as a T-score, which compares the patient's BMD to that of a healthy young adult, and a Z-score, which compares the patient's BMD to that of others of the same age and sex.

How to Prepare for DEXA Scan?

Dos:

• Inform your doctor about any medications you are taking, as some may interfere with the scan results.
• Wear loose, comfortable clothing without metal zippers, buttons, or embellishments.
• Remove any jewellery or metal objects before the scan.
• Bring any relevant medical records or previous DEXA scan report.

Don'ts:

• Don't take calcium supplements for at least 24 hours before the scan.
• Don't undergo the scan if you are pregnant or suspect you might be pregnant.
• Don't wear clothes with metal attachments or embellishments.
• Don't move during the scan, as this can affect the accuracy of the results.
• Don't undergo any barium exams or receive an injection of contrast material for a CT or radioisotope scan within the week before your DEXA scan.

Why is DEXA Scan Recommended?

A DEXA scan may be recommended for various reasons, including:

• To screen for osteoporosis in postmenopausal women and older men.
• To assess the risk of fractures in individuals with a history of bone fractures or other risk factors.
• To monitor the effectiveness of osteoporosis treatment and track changes in bone density over time.
• To diagnose osteoporosis in individuals with known risk factors, such as a family history of the condition or long-term use of certain medications.
• To evaluate bone health in individuals with conditions that can affect bone density, such as rheumatoid arthritis or chronic kidney disease.