DEXA Scan Explained: Bone Health, Osteoporosis & Body Composition

What is a DEXA Scan?

A DEXA scan, also known as a DXA scan, is a specialised diagnostic imaging examination that uses two very low-dose X-ray beams to measure bone mineral density (BMD). It is considered the standard imaging method for assessing bone health and identifying changes that may increase the risk of fractures.

Unlike a standard X-ray, which is primarily used to identify fractures or injuries, a DEXA scan is designed to measure the amount of mineral present within the bones. This information helps healthcare providers evaluate bone strength and determine whether conditions such as osteopenia or osteoporosis may be present.

Depending on the type of examination requested, some DEXA systems can also analyse body composition by measuring lean muscle mass, body fat percentage and fat distribution.

Why Bone Health Matters

Bone is living tissue that continually breaks down and rebuilds throughout life. During early adulthood, the body generally builds bone faster than it loses it. As we age, however, bone loss gradually increases, making bones thinner and more fragile.

Reduced bone density often develops without noticeable symptoms, meaning many people are unaware of changes until they sustain a fracture from a minor fall or everyday activity.

Maintaining good bone health is important because strong bones help:

Certain factors, including ageing, menopause, family history, medical conditions and long-term use of some medications, can increase the likelihood of bone loss. A DEXA scan provides valuable information that may assist your healthcare provider in assessing these risks.

How Does a DEXA Scan Work?

A DEXA scanner uses two low-dose X-ray beams that pass through specific areas of the body, most commonly the lumbar spine and hips. The scanner measures how much of each X-ray beam is absorbed by the bones, allowing sophisticated software to calculate bone mineral density.

For body composition examinations, the scanner also distinguishes between bone, lean tissue and fat tissue. This provides detailed information about body composition that may be useful in certain clinical situations.

The examination is completely painless. There are no injections, no contrast dye and no recovery period required afterwards.

What Does a DEXA Scan Measure?

Depending on the examination requested by your healthcare provider, a DEXA scan may assess several important aspects of your health.

Who Should Consider a DEXA Scan?

A DEXA scan is not only recommended for people who have already been diagnosed with osteoporosis. It may also be appropriate for individuals who have risk factors for reduced bone density or an increased likelihood of fractures. Your GP or specialist will determine whether a DEXA scan is suitable based on your medical history, age, symptoms and overall health.

Early assessment of bone health can help identify changes before symptoms develop, allowing your healthcare provider to recommend appropriate monitoring or management where clinically indicated.

Bone Density vs Body Composition: What's the Difference?

Although both assessments can be performed using DEXA technology, they provide different types of information. Understanding the difference helps explain why your healthcare provider may request one examination over the other.

While both examinations use the same technology, the information collected and the reason for the referral may differ depending on your healthcare needs.

Osteopenia vs Osteoporosis

Many people hear the terms osteopenia and osteoporosis together, but they are not the same condition. Both relate to reduced bone density, although osteoporosis represents a more advanced stage of bone loss.

A DEXA scan helps your healthcare provider determine where your bone density falls and whether ongoing monitoring or further management may be appropriate.

Understanding Your DEXA Scan Results

After your examination, a specialist radiologist reviews the images and prepares a report for your referring healthcare provider. Your GP or specialist will explain the findings and discuss what they mean in the context of your overall health.

The report commonly includes two important measurements:

 

It is important to remember that your DEXA scan results are only one part of your overall health assessment. Your healthcare provider will interpret the findings alongside your symptoms, medical history, lifestyle and any other investigations.

Why Early Bone Health Assessment Matters

Bone loss often occurs gradually and without noticeable symptoms. Many people do not realise their bones have become weaker until they experience a fracture following a minor fall or everyday activity.

Assessing bone health before complications develop may help your healthcare provider identify changes earlier and recommend appropriate monitoring, lifestyle advice or treatment where clinically indicated.

Maintaining healthy bones throughout life may also support mobility, independence and overall quality of life as you age.

Preparing for Your DEXA Scan

One of the advantages of a DEXA scan is that it usually requires very little preparation. Your imaging provider will let you know if any specific instructions apply to your appointment. Following these instructions helps ensure accurate results and a smooth examination.

What Happens During a DEXA Scan?

A DEXA scan is a simple, painless and non-invasive examination. Most appointments are completed within 10 to 20 minutes, although this may vary depending on the type of assessment being performed.

During the examination, you will lie comfortably on a padded scanning table while the imaging arm passes slowly over the area being examined. The scanner does not enclose your body, and there are no injections, contrast dye or sedation involved.

To obtain clear images, you may be asked to remain still for a short period while the scan is performed.

Is a DEXA Scan Safe?

A DEXA scan uses very low-dose X-ray radiation, significantly lower than many other diagnostic imaging examinations. For most people, the examination is considered safe when performed for an appropriate medical reason.

Like all imaging examinations involving X-rays, a DEXA scan should only be performed when clinically indicated and requested by your healthcare provider.

If you are pregnant or think you may be pregnant, it is important to inform the imaging team before your appointment so appropriate advice can be provided.

Benefits of a DEXA Scan

A DEXA scan provides valuable information about bone health and, when requested, body composition. The results may help your healthcare provider make informed decisions about further assessment, monitoring or treatment.

Are There Any Limitations?

While a DEXA scan is considered the standard imaging test for measuring bone mineral density, it is only one part of your overall health assessment.

A DEXA scan does not identify every cause of bone pain or diagnose all bone conditions. Your healthcare provider will interpret the results alongside your medical history, symptoms, physical examination and any other investigations that may be required.

Body composition results should also be considered within the context of your overall health rather than in isolation.

DEXA Scans at CareWell Diagnostix

At CareWell Diagnostix, we provide DEXA Bone Density Scans in a professional, patient-focused environment using modern diagnostic imaging technology.

If your GP or specialist has referred you for a DEXA scan, our experienced team is committed to making your visit as comfortable and straightforward as possible. We understand that every patient's healthcare journey is different and take the time to explain the examination and answer any questions before your appointment.

Following your scan, your images will be reviewed by a specialist radiologist, and a report will be sent to your referring healthcare provider to assist with your ongoing care.

Related Diagnostic Imaging Services

Depending on your symptoms and your healthcare provider's referral, you may also benefit from other diagnostic imaging services available at CareWell Diagnostix.

• Ultrasound
• General X-Ray
• CT Scan
• DEXA Bone Density Scan
• Liver Elastography (FibroScan)
• Ultrasound Guided Procedures

Supporting Patients Across Melbourne's West

CareWell Diagnostix proudly provides diagnostic imaging services for children and families across Tarneit, Werribee, Point Cook, Hoppers Crossing, Truganina, Williams Landing, Wyndham Vale, Manor Lakes, Seabrook, Laverton, Altona Meadows and surrounding communities throughout Melbourne's West.

If your GP or specialist has referred you for a DEXA scan or another diagnostic imaging examination, our team is here to provide professional care, appointment guidance and support throughout your visit.

You May Also Find These Articles Helpful

Learning about your imaging appointment doesn't have to stop here. Our patient education articles are designed to help you better understand different diagnostic imaging examinations, how to prepare for them and what to expect before, during and after your appointment.

If you're looking for more information, these guides may also be helpful:

Key Takeaways

• A DEXA scan is the standard imaging examination used to measure bone mineral density and assess bone health.
• Some DEXA examinations can also provide detailed information about body composition, including body fat percentage, lean muscle mass and fat distribution.
• The examination is quick, painless, non-invasive and uses very low-dose X-ray radiation.
• Most people require little preparation and can return to their normal activities immediately after the scan.
• Your healthcare provider will interpret your results alongside your medical history and other clinical findings to determine the most appropriate next steps.