metabolism X ray explained

Overview

A metabolism X-ray, also called a bone density scan or DEXA scan, is a safe, painless imaging test that measures the strength and thickness of your bones. It uses a small amount of X-rays to see how much calcium and other minerals are packed into a section of bone. This helps doctors assess your bone metabolism — how your body is building and breaking down bone tissue.

Yes. Bone density scans are one of the most common diagnostic tools for osteoporosis and other metabolic bone conditions. Millions of these scans are performed every year across the UK and worldwide.

Anyone can need a bone density scan, but it is most often used for people at higher risk of bone thinning, including postmenopausal women, older adults, people taking certain medications, or those with conditions affecting calcium absorption.

Symptoms

Common symptoms

• Back pain, often caused by a small fracture in the spine
• Gradual loss of height
• Bones that break more easily than expected

Causes

Main causes

• Aging and natural loss of bone tissue
• Lack of calcium and vitamin D
• Hormonal changes, especially after menopause

Risk factors

• Family history of osteoporosis
• Use of corticosteroid medicines
• Smoking or excessive alcohol intake
• Low body weight or eating disorders

When to see a doctor

See a doctor urgently if:

• Sudden severe pain or inability to bear weight after a fall
• A bone that breaks with little or no injury

Book a routine appointment if:

• You are 65 or older and have not had a bone density scan
• You have risk factors such as early menopause, long-term steroid use, or a history of fractures

Diagnosis

A bone density scan is the most common method. Your doctor may also use a simple questionnaire to estimate your risk before ordering the scan.

Tests that may be done

• Bone density scan (DEXA) of the hip and spine
• Blood tests to check calcium, vitamin D, and thyroid function
• Fracture risk tools like FRAX

What to expect at your appointment

You will lie on a comfortable table. A small scanning arm passes over your body. It is painless. You should not need to undress, but avoid metal buttons and zippers. The whole visit usually takes about 20 minutes.

Treatment

Treatment for low bone density focuses on preventing falls, strengthening bones, and addressing underlying causes. Your healthcare team will create a plan based on your scan results.

Self-care at home

• Eat a calcium-rich diet with dairy, leafy greens, and fortified foods
• Get regular weight-bearing exercise like walking or dancing
• Stop smoking and limit alcohol

Medical treatments

Your doctor may prescribe a medication that helps slow bone loss or build bone. These are usually taken by mouth or as an injection. The choice depends on your personal situation and scan results.

When is surgery considered?

Surgery is not usually needed for low bone density itself. However, if a fracture has occurred, you may need a procedure to fix the bone, such as a hip or spinal repair.

Living with this condition

Most people live well with low bone density. Simple home safety changes — like removing rugs and adding grab bars — can prevent falls.

Lifestyle tips

• Do balance exercises like tai chi or yoga
• Make your home safe and well-lit
• Wear supportive shoes

Diet and exercise

Aim for a balanced diet with 700–1000 mg of calcium per day from food when possible, plus vitamin D. Weight-bearing physical activity helps muscles and bones stay strong.

Mental health and emotional wellbeing

A diagnosis of bone thinning can feel worrying, but it is manageable. Some people feel anxious about fractures. Talking to your doctor or a support group can help.

Prevention

You can reduce your risk of bone problems at any age by eating well, staying active, and not smoking. Even if you have risk factors, these steps help.

Screening programmes

In the UK, the NHS offers bone density scans to people at highest risk, such as those over 65 with risk factors, or after a fragility fracture.

Complications

If left untreated

• Increased risk of hip, spine, and wrist fractures
• Loss of mobility and independence
• Chronic pain and reduced quality of life

Long-term outlook

With the right care, most people maintain an active life. A bone density scan helps you and your doctor act early to keep your bones strong.

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