Introduction
Osteoporosis is often described as a “silent” condition because many people do not know they have it until they experience a fracture. As bone density gradually decreases, bones can become more fragile and more likely to break following a fall or minor injury. This is why understanding your bone health and osteoporosis risk can be an important part of looking after your health as you age.
But can a DEXA scan actually predict your risk of developing osteoporosis?
The short answer is yes, a DEXA scan can provide valuable information about your current bone density and help assess your future risk of osteoporosis and fractures. However, a DEXA scan is not a crystal ball. Your results need to be considered alongside your age, medical history, lifestyle and other risk factors.
What Is a DEXA Scan?
A DEXA scan, is a low-dose X-ray examination used to measure bone mineral density (BMD). It commonly measures areas such as the hip and lumbar spine, which are important sites for assessing bone strength and fracture risk.
A DEXA bone density scan can help identify whether your bone density is within the expected range or whether you have reduced bone density, known as osteopenia, or osteoporosis.
Because bone loss can happen without obvious symptoms, a bone density test for osteoporosis can provide information that may otherwise be difficult to identify.
Can a DEXA Scan Predict Osteoporosis?
A DEXA scan can help identify whether you currently have low bone density and can contribute to an assessment of your risk of developing osteoporosis or experiencing a fracture in the future.
Your DEXA report will usually include a T-score, which compares your bone mineral density with that of a healthy young adult reference population.
Generally:
- T-score of -1.0 or above: considered normal bone density
- T-score between -1.0 and -2.5: classified as osteopenia
- T-score of -2.5 or below: consistent with osteoporosis in the appropriate clinical context
An osteopenia result does not necessarily mean that you will develop osteoporosis. However, it can be an important warning sign that your bone density is below the optimal range and that you may benefit from taking steps to protect your bone health.
What Else Affects Your Risk of Osteoporosis?
Your DEXA results are only one part of the picture.
Your healthcare professional may also consider factors such as:
- Your age
- Sex
- Family history of osteoporosis or fractures
- Previous fractures
- Menopause and hormonal changes
- Body weight
- Physical activity levels
- Calcium and vitamin D intake
- Smoking
- Alcohol consumption
- Certain medications, including long-term corticosteroid use
- Certain medical conditions
These factors can influence your osteoporosis risk even if your bone density results do not show osteoporosis
Can a DEXA Scan Predict Your Fracture Risk?
A DEXA scan is particularly useful because bone density is closely linked to fracture risk. However, bone density alone does not determine your overall fracture risk.
For example, two people can have similar DEXA results but different risks of experiencing a fracture because of differences in age, previous fractures, falls, medications and other health factors.
This is why your doctor may combine your bone mineral density results with other information when assessing your overall fracture risk.
Why Is Early Bone Density Testing Important?
One of the advantages of a DEXA bone density test is that it can identify reduced bone density before you necessarily experience a fracture.
Osteopenia can act as an early warning sign. Identifying lower bone density gives you an opportunity to discuss your risk factors with your doctor and consider appropriate strategies for maintaining bone health. These may include weight-bearing exercise, strength training, adequate calcium and vitamin D, reducing smoking and limiting alcohol consumption.
For people with risk factors for osteoporosis, knowing your bone density can therefore be an important step towards taking action before a fracture occurs.
Who Should Consider a DEXA Scan?
Whether you should have a DEXA scan for osteoporosis depends on your individual circumstances.
In Australia, bone density testing may be recommended for people with particular risk factors, medical conditions, previous fractures or age-related risk.
If you are concerned about your bone health, speak with your GP or healthcare professional about whether a DEXA scan is appropriate for you.
Frequently Asked Questions
Can a DEXA scan show if I have osteoporosis?
Yes. A DEXA scan is commonly used to help diagnose osteoporosis by measuring bone mineral density. Your results will usually include a T-score, which can help determine whether your bone density falls within the normal range, osteopenia range or osteoporosis range.
What T-score indicates osteoporosis?
A T-score of -2.5 or below is generally consistent with osteoporosis when interpreted in the appropriate clinical context. Your healthcare professional will consider your complete results and medical history rather than relying on the number alone.
Does osteopenia mean I will get osteoporosis?
Not necessarily. Osteopenia means your bone density is lower than normal but not low enough to meet the usual DEXA criteria for osteoporosis. It can indicate an increased risk of future osteoporosis and fractures, so it is an opportunity to discuss bone health and risk reduction with your healthcare professional.
Book a DEXA Scan in Perth
Perth DEXA Scan provides accurate, clinically reported bone density testing for patients across Perth. Whether you have been referred by your GP or are seeking a scan independently, our team can guide you through the process. To book your appointment or learn more, visit perthdexascan.com.au.