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A bone density scan is also called a DEXA (dual-energy X-ray absorptiometry) scan; it is a fast, comfortable test designed to measure your bone density accurately. It uses very low-dose X-rays to assess how much mineral content, mainly calcium, is present in your bones. The most commonly scanned areas are the hip and lower spine, as these sites are most vulnerable to fractures.

This scan helps doctors evaluate bone strength and diagnose conditions like osteoporosis before fractures occur. It can also monitor bone health over time, especially if you have risk factors such as age, family history, or previous fractures.

Recommendation of Bone Density Scan

Your ortho may recommend a bone density scan if you:

• Are aged 50 or over with risk factors for osteoporosis
• Have had a previous fracture from a minor injury
• Experience symptoms suggestive of spinal fractures, such as height loss or back pain
• Have medical conditions or take medications that affect bone health
• Are postmenopausal, particularly women, due to the natural decline in oestrogen affecting bone density.

The scan is also useful for younger individuals with specific health concerns, though interpretation differs in these cases.

Bone Density Scan Procedure

The procedure is straightforward and usually takes 10 to 30 minutes. You will lie on your back on a padded X-ray table. The scanning arm of the DEXA machine will pass slowly over your hip and spine, sending low-dose X-rays through your bones. You will need to remain still and may be asked to hold your breath briefly to ensure clear images.

Depending on your circumstances, other areas such as the forearm or wrist may also be scanned. In some cases, a peripheral DEXA scan (p-DEXA) of the wrist or heel can be performed, which is quicker but less detailed.

You may be asked to wear clothing without metal fasteners, or a hospital gown may be provided to avoid interference with the scan images.

Understanding Your Results

Results are usually expressed as T-scores and Z-scores:

T-score: This measurement indicates how your bone density stacks up against that of a healthy young adult at their optimal bone strength.

• A score above -1.0 is considered within the normal range.
• A score between -1.0 and -2.5 points to reduced bone density, also known as osteopenia.
• A score below -2.5 indicates osteoporosis, a condition marked by fragile bones.

Z-score: This score reflects how your bone density measures up against the average bone density for individuals of the same age and gender. It’s especially useful for evaluating bone health in children, teens, and premenopausal women or younger men.

Your doctor will interpret these scores alongside other factors such as age, medical history, and fracture risk to decide if treatment or lifestyle changes are needed. It is important to note that bone density alone does not predict fractures perfectly; other risk factors also play a role.

Conclusion

A bone density scan is a simple, effective way to assess bone health and identify risks for osteoporosis and fractures early. By understanding the process and what your results mean, you can take informed steps to protect your bones through lifestyle changes, medical treatment, or both. If you have concerns about your bone health or think you may benefit from a scan, speak to your doctor for personalised advice. Taking care of your bones today helps ensure mobility and independence for tomorrow.

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