How to Prepare for a DEXA Bone Scan: A Patient’s Guide

Learn how to prepare for a DEXA Bone Scan, what to wear, foods to avoid, and what to expect before your bone density test in Safdarjung Enclave.

What is a DEXA Bone Scan?

A DEXA (Dual-Energy X-ray Absorptiometry) scan is the gold standard for measuring bone mineral density and assessing the risk of osteoporosis and fractures. The scan is quick, painless, and uses very low-dose X-rays.

Who Needs a DEXA Scan?

Your doctor may recommend one if you:

• Are over 65 years of age
• Have a family history of osteoporosis
• Have experienced a low-impact fracture
• Are postmenopausal
• Use long-term steroid medication
• Have certain endocrine or nutritional disorders

How to Prepare for Your DEXA Scan

Preparation is simple:

• Avoid calcium supplements for at least 24 hours before the scan.
• Wear loose, comfortable clothing without metal zippers, buttons, or underwires.
• Remove jewelry, belts, watches, and other metallic accessories before the scan.
• Inform the radiology team if you are pregnant or think you may be pregnant.
• If you recently had a CT scan or X-ray with contrast (such as barium), let your doctor know, as the DEXA scan may need to be postponed for a few days.

Unlike many imaging tests, fasting is not required, and you can continue eating and drinking normally unless instructed otherwise.

What Happens During the Scan?

You will lie comfortably on a padded examination table while a scanning arm passes slowly over your body. The procedure is painless, and you simply need to remain still for clear images.

A DEXA scan usually takes about 10 to 20 minutes, depending on the areas being examined.

Understanding Your Results

Your report will typically include:

• T-score: Compares your bone density to that of a healthy young adult.
• Z-score: Compares your bone density with people of your age, sex, and body size.

Your doctor will explain what these scores mean and whether any treatment or lifestyle changes are needed.

Why Early Detection Matters

Osteoporosis often develops without symptoms until a fracture occurs. Detecting reduced bone density early allows you to take steps—such as medication, diet, exercise, and lifestyle changes—to protect your bone health and reduce future fracture risk.

FAQs

Do I need to fast before a DEXA scan?
No. You can eat and drink normally unless your doctor advises otherwise.

Is the scan painful?
No. It is completely painless and non-invasive.

How much radiation does it use?
A DEXA scan uses a very low radiation dose, much lower than a standard chest X-ray.

Can I drive home afterward?
Yes. You can return to your normal routine immediately after the scan.

Conclusion

A DEXA bone scan is a simple, safe, and effective way to evaluate bone health and detect osteoporosis early. Proper preparation helps ensure accurate results and a smooth experience.