When should someone be referred for a DEXA scan? 

In the UK, a referral for a DEXA (Dual-energy X-ray Absorptiometry) scan is not a routine screening for everyone. Instead, it is a targeted diagnostic tool used when a healthcare professional identifies that an individual is at an increased risk of osteoporosis or fragility fractures. The criteria for referral are guided by the National Institute for Health and Care Excellence (NICE) and are designed to catch bone thinning early in those most vulnerable. Whether the referral is prompted by a previous injury, a long-term medical condition, or a calculation of future risk, the scan provides the definitive data needed to guide preventative care. 

What We’ll Discuss in This Article 

• The role of the FRAX tool in determining referral necessity 

• Why sustaining a “fragility fracture” is an immediate trigger for a scan 

• The impact of age and the menopause on referral guidelines 

• Medical conditions and medications that warrant a bone density check 

• How family history and lifestyle factors influence the decision 

• The pathway from a GP consultation to a DEXA appointment 

A referral often begins with a 10-year fracture risk calculation. 

For many patients in the UK, the journey to a DEXA scan begins with a clinical assessment tool called FRAX or QFracture. During a consultation, a GP enters your data, including age, weight, smoking status, and alcohol intake, into a computerised model that calculates the probability of you breaking a bone over the next decade. 

If this calculation shows that your risk is in the “intermediate” or “high” range, the GP will typically refer you for a DEXA scan to see if your actual bone density matches the risk profile. This evidence-based approach ensures that scans are prioritised for those who would most benefit from potential treatment. According to NICE guidance, this assessment is the standard first step for most adults over the age of 50. 

Sustaining a fragility fracture is a primary reason for a DEXA referral. 

One of the most common reasons for a referral is the occurrence of a fragility fracture. This is a broken bone, typically in the wrist, hip, or spine, that results from a minor impact, such as a fall from a standing height. In a healthy skeleton, such a fall should not result in a break. 

If you are over the age of 50 and experience a fragility fracture, UK health protocols suggest you should be assessed for osteoporosis. In many areas, this is managed through a Fracture Liaison Service (FLS), which automatically identifies fracture patients in the hospital and refers them for a DEXA scan to ensure that a “second” fracture can be prevented through early diagnosis and treatment. 

Certain medical conditions and life stages warrant a proactive scan. 

Beyond injury, a referral may be made if you have an underlying condition or are at a life stage known to accelerate bone loss. Key groups include: 

• Postmenopausal Women: Specifically those who experienced an early menopause (before age 45) or have had their ovaries removed, as the drop in oestrogen leads to rapid bone thinning. 

• Long-term Steroid Users: Anyone taking oral steroid tablets (like prednisolone) for three months or more, as steroids are directly toxic to bone-building cells. 

• Endocrine Disorders: Individuals with an overactive thyroid or overactive parathyroid glands. 

• Malabsorption Issues: People with Coeliac disease, Crohn’s disease, or those who have had gastric bypass surgery, which can prevent the absorption of calcium and vitamin D. 

Personal risk factors like family history and low BMI influence the referral. 

Your GP may also refer you for a scan if you have specific physical or genetic risk factors that suggest your “peak bone mass” might be low. A strong family history, particularly if a parent suffered a hip fracture, is a significant indicator of inherited bone fragility. 

Additionally, having a low Body Mass Index (BMI) of 19 or less is a recognised risk factor. People with very low body weight often have thinner bones and less protective fat to cushion a fall, making a bone density assessment highly relevant. Other factors, such as long-term immobilisation or a history of eating disorders, will also be considered during a bone health review. 

Managing the referral process through the NHS. 

In the UK, most DEXA scan referrals are made by a GP, although they can also be initiated by a hospital consultant (such as a rheumatologist or orthopaedic surgeon). Once the referral is made, you will typically receive an appointment at a hospital radiology department or a specialist bone clinic. 

The results of the scan are usually sent back to the referring doctor within one to two weeks. It is important to note that the scan is just one part of the diagnosis; your doctor will combine the DEXA results with your initial FRAX score and overall health profile to decide if medication or lifestyle changes are necessary. If you believe you meet the criteria for a scan but have not been referred, you should discuss your concerns and risk factors directly with your GP. 

Conclusion 

A referral for a DEXA scan is a targeted clinical decision based on an individual’s specific risk profile. Whether triggered by a fragility fracture, an early menopause, long-term steroid use, or a high FRAX score, the scan is the essential tool for confirming a diagnosis of osteoporosis. By identifying bone thinning early, UK healthcare providers can implement the necessary treatments to protect the skeleton and maintain a patient’s future mobility. If you have concerns about your bone health or have a family history of fractures, seek a medical review. If you experience severe, sudden, or worsening symptoms, call 999 immediately. 

Authority Snapshot (E-E-A-T Block) 

This article outlines the clinical criteria for DEXA scan referrals within the UK healthcare system. It has been written and reviewed by Dr. Stefan Petrov, a UK-trained physician, to ensure accuracy and adherence to current NHS and NICE standards. The information is designed to help patients understand when a bone density assessment is medically necessary and how the referral process functions.