growth X ray explained

Overview

A growth X-ray is a quick, painless imaging test that uses a very small amount of radiation to take pictures of a child's bones, usually the left hand and wrist. It helps doctors estimate 'bone age' — a way to see how much growing a child has left. This can help explain why a child is growing faster or slower than expected.

Yes, growth X-rays are a routine and widely available test for children with growth concerns.

It is mainly used for children and teenagers, but it can also be helpful for young adults who are still growing.

Symptoms

Common symptoms

• A child is much shorter or taller than most children of the same age and sex.
• Growth seems to have slowed down or stopped over several months.
• A child's growth curve has crossed percentile lines on a growth chart.

Symptoms in children

• Delayed tooth development or delayed puberty.
• One arm or leg appears shorter than the other.
• Fingers or hands look unusually short or long compared with the rest of the body.

Symptoms in older adults

• Growth X-rays are not typically needed for older adults. In this age group, bone X-rays are more often used for fractures, arthritis, or other bone conditions — not for assessing growth.

Causes

Main causes

• To investigate slow or rapid growth outside the typical range for age and sex.
• To evaluate a suspected growth plate injury, such as a fracture near the end of a bone.
• To help diagnose endocrine disorders, such as growth hormone problems or thyroid conditions, when combined with other tests.

Risk factors

• A family history of growth problems or delayed puberty.
• Chronic illness that can affect growth, such as kidney disease or inflammatory bowel disease.
• Certain medications, such as corticosteroids, that can slow growth.

When to see a doctor

See a doctor urgently if:

• If your child has severe limb pain, swelling, or deformity after an injury, seek same-day care or go to an emergency department.
• If a child suddenly cannot walk or bear weight on a leg, get urgent medical assessment.

Book a routine appointment if:

• If you are worried about your child's growth, height, or development, make an appointment with your GP or paediatrician.
• If your child's growth has slowed or stopped on a growth chart, discuss it with a healthcare professional.

Diagnosis

A growth X-ray is used to estimate bone age. A doctor, often a radiologist, takes one X-ray of the left hand and wrist, then compares the bony structures to a standard bone development atlas to determine how much growth remains.

Tests that may be done

• X-ray of the left hand and wrist (the standard view for bone age).
• Sometimes an X-ray of the knee or other growth plates may be requested.
• A growth hormone stimulation test, if your doctor suspects a hormone problem.

What to expect at your appointment

The test is performed in a radiology department. You will be asked to remove clothing or jewellery that might block the X-ray. Your child will place one hand flat on the X-ray plate, and the radiographer will take the picture from a short distance. The whole visit usually takes about 10–15 minutes, and your child can return to normal activities immediately afterwards.

Treatment

A growth X-ray itself is a test, not a treatment. If the results show that growth is outside the typical range, your doctor will discuss the possible causes and next steps. Treatment will depend on the underlying condition that is affecting growth.

Self-care at home

• Follow your doctor's advice about monitoring your child's growth at home.
• Encourage a balanced diet, regular activity, and enough sleep — all important for healthy growth.
• Keep a growth chart at home if your doctor suggests it.

Medical treatments

If a hormonal or nutritional cause is found, treatment may include hormone therapy, nutritional support, or managing an underlying condition. Your doctor will explain the options and refer you to a specialist if needed. Always discuss the benefits and risks of any treatment with your healthcare team.

When is surgery considered?

Surgery is rarely needed for growth problems themselves. If a growth plate fracture is found, surgery may be considered for certain types of fractures. This will be decided by an orthopaedic surgeon.

Living with this condition

If your child has a growth concern, it can help to keep a record of height and weight, attend follow-up appointments, and ask your child's doctor about any worries you have. Growth issues are often manageable with the right support.

Lifestyle tips

• Encourage physical activity and outdoor play, which supports bone health.
• Make sure your child gets enough sleep, as growth hormone is released during deep sleep.
• Minimise stress and maintain a supportive home environment.

Diet and exercise

A balanced diet with enough calcium and vitamin D is important for bone health. Encourage regular weight-bearing exercise like running or sports, as this helps keep bones strong. If you have concerns about your child's diet, ask a paediatric dietitian.

Mental health and emotional wellbeing

Being shorter or taller than peers can sometimes affect a child's self-esteem. Talk openly with your child about their feelings, and remind them that everyone grows at their own pace. If you notice significant anxiety or sadness, speak to your healthcare provider.

Prevention

Growth problems are not always preventable, as many are due to genetics or underlying medical conditions. However, ensuring good general health — with proper nutrition, sleep, and regular check-ups — can support normal growth.

Vaccines

This is not relevant to growth X-rays. However, routine childhood vaccinations protect against infections that can, in rare cases, affect growth. Speak to your health visitor or doctor about the recommended immunisation schedule.

Screening programmes

Some growth problems can be picked up at routine child health checks by measuring height and weight. If you are concerned, ask your doctor to plot your child's measurements on a growth chart.

Complications

If left untreated

• If a growth problem is left unassessed, an underlying condition such as a hormone disorder may not be detected and treated promptly.
• A missed growth plate fracture could lead to limb shortening or a crooked bone.
• A growth delay may lead to persistent differences in height compared with peers.

Long-term outlook

The outlook is generally positive. Many growth concerns are simply due to normal variation. Where a medical cause is found, early assessment and treatment can often help a child reach their full growth potential. Your healthcare team will guide you through the process.

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