A pediatric DXA scan is a quick, low-radiation X-ray test that measures how much mineral your child's bones contain, and it is read very differently from an adult scan. Doctors order it when they suspect fragile or slowly developing bones, for example after repeated fractures or because of a chronic illness or long-term medication. There is no universal minimum age, the scan itself takes only a few minutes, and the result is a Z-score compared with other children, not the T-score adults get.
This guide covers who needs the test, how to prepare, what the numbers mean and what follows. It also covers what to ask a clinic before you book, including for teens.
TL;DR
- Doctors use pediatric DXA to check for fragile bones after recurrent or low-impact fractures, or when a condition, immobility, poor nutrition or a medication may be weakening bone.
- There is no single minimum age. The ISCD says DXA is appropriate even in infants and young children, with lumbar-spine measurements feasible from 0 to 5 years.
- Children get Z-scores, not T-scores, and pediatric osteoporosis is never diagnosed from the scan alone.
- Radiation is very low, less than one-tenth of a standard chest X-ray, and each scan takes about 1 to 3 minutes.
- Before booking anywhere, confirm the site can use pediatric reference data and that your child's doctor will review the report.
Table of Contents
- Why a child or teen might need a bone density test
- What a pediatric DXA scan measures
- Is there a minimum age?
- How to prepare your child
- Is the radiation safe?
- How pediatric results are read
- What happens after the scan
- Choosing where to have the scan
- Our perspective
- Find a DEXA clinic and compare cash prices
- FAQ
- Sources
Why a child or teen might need a bone density test
Most children never need one. The test is reserved for situations where clinicians suspect bones are fragile or not developing as they should. The American Academy of Pediatrics lists recurrent or low-impact fractures, bone pain or deformity, genetic disorders, chronic illness, immobility, poor nutrition and bone-weakening treatments among the reasons. Its report also notes that the test helps estimate the risk of skeletal fragility, supports treatment decisions and can monitor how a therapy is working.
In practice, that covers a few groups:
- Children with fractures that don't fit the injury. A broken bone from a minor fall, or several breaks over a few years, raises the question of whether the bone itself is the problem.
- Children with chronic conditions. Long illnesses can affect bone building directly or through reduced activity and nutrition.
- Children on medications that affect bone. The AAP discusses long-term glucocorticoid (steroid) exposure as one example. The ISCD pediatric positions recommend assessing children who may benefit from an intervention that reduces fracture risk.
- Children who can't bear weight normally. Prolonged immobility or reduced weight-bearing can leave bones less dense.
- Children with genetic or acquired bone disorders, where the scan establishes a baseline and tracks change.
A healthy teenager who simply wants to know their bone health is not the typical case. Adult screening rules, such as the ones in our guide to bone density by age for U.S. adults, do not apply to kids. For children, the decision starts with a pediatrician or specialist.
What about teen athletes?
Teens who train hard, restrict food or have a history of stress fractures sometimes ask about a scan. That is a conversation for the pediatrician or a sports medicine doctor, because poor nutrition is one of the recognized reasons for testing and the doctor can look at the whole picture: growth, diet, activity and fracture history. A scan is one piece of that picture.
What a pediatric DXA scan measures
DXA stands for dual-energy X-ray absorptiometry. According to the Pediatric Endocrine Society, the child lies on a table while a scanning arm passes overhead and takes pictures of the bones, with each scan taking about 1 to 3 minutes. A DXA scan can also show how much of the body is made up of bone, muscle and fat, which is why the same machine is used for both bone and body composition work.
The ISCD names the lumbar spine and total body less head (TBLH) as the preferred sites for children. The head is excluded from the total-body measurement because it makes up a large share of a child's bone mineral and would distort the picture of the rest of the skeleton. Depending on the question, a doctor may also request the hip or forearm.
What the scan can't see
DXA gives a flat, two-dimensional picture. As the AAP report explains, the measurement corrects for the area of bone but not its volume, meaning it does not account for thickness. A small child has smaller bones, so raw numbers can look low even when bones are healthy. That is why the report must be adjusted and interpreted by someone trained in pediatrics.
Is there a minimum age?
No universal minimum applies. The ISCD says DXA is appropriate even in infants and young children, and that lumbar-spine measurements can be feasible from 0 to 5 years. The real limit is practical: the child has to lie still, and the ISCD stresses that a scan should not be done if safe and appropriate positioning cannot be ensured.
So a toddler may be scanned at a children's hospital with staff used to young patients, while a general imaging center may not take the same child. Each facility sets its own policy, so ask before you book.
How to prepare your child
Preparation is simple. Based on guidance from Children's Hospital of Philadelphia:
- Dress for the scan. Remove metal objects. Avoid clothing with zippers or snaps. Comfortable clothing with no metal is the easiest choice.
- Skip calcium supplements that day. Avoid them on the day of the scan.
- Mention recent contrast studies. Tell the staff if your child had a barium study, or a CT or MRI with contrast, within 7 days of the DXA.
- Explain what will happen. Tell your child they will lie on a table and hold still while an arm moves overhead. For a younger child, a favorite blanket, a short video or a parent standing nearby can help, if the clinic allows it.
For a general picture of the appointment flow, our walkthrough of the DEXA scan procedure covers check-in, positioning and timing. Pediatric visits follow the same basic steps, with extra attention to keeping the child still and comfortable.
During and after
The scan is painless. Your child lies still, and the technologist captures each image in a minute or two. Afterward, your child can return to normal activities, so school or sports the same day are fine unless the doctor says otherwise.
Is the radiation safe?
DXA uses very little radiation. The Pediatric Endocrine Society says the exposure is less than a day's exposure to natural radiation and less than one-tenth the dose of a standard chest X-ray. If you are concerned about a specific situation, such as a child who has had many imaging studies, ask the ordering doctor how the scan fits into the overall plan.
How pediatric results are read
This is where children differ most from adults. If you have seen adult reports with T-scores and a diagnosis of osteopenia or osteoporosis, set that aside.
Z-scores, not T-scores
Children are still growing, so their bone mineral content changes with size, shape and age. An NCBI review of pediatric DXA describes this as the reason interpretation is complex. The ISCD says results should be expressed as Z-scores using reference data that account for age, sex and race or ethnicity. A Z-score compares your child with other children of the same age and sex, not with a healthy young adult.
The ISCD's preferred wording for a Z-score of -2.0 or below is "low bone mineral mass or bone mineral density," not osteoporosis.
Size matters
A child who is short for their age may have a low Z-score simply because the bones are small. Specialists adjust for height or growth stage so the number reflects bone quality, not body size. If your report shows a low value, ask whether it has been adjusted.
A low score is not a diagnosis
The ISCD says pediatric osteoporosis should not be diagnosed from DXA alone. Its definition of a clinically significant fracture history is at least two long-bone fractures by age 10, or at least three by age 19. Without a vertebral compression fracture, pediatric osteoporosis requires both that fracture history and a BMD Z-score of -2.0 or lower.
Two things follow from this:
- A low score without a fracture history is a finding to investigate, not a label.
- A normal score does not erase a concerning fracture history. The doctor weighs both.
What happens after the scan
A specially trained physician analyzes the images, and the report goes to the ordering doctor, who reviews it with the family. Do not try to interpret the numbers from a printout alone.
Follow-up depends on the result and the child's condition. At one major children's hospital, the clinical pathway says follow-up may include referral to a bone health center, and that repeat scans are done as clinically indicated based on the body system involved or the scan interpretation. There is no one-size repeat schedule for children. Your doctor decides it from the underlying condition and the first result.
Questions worth asking at the results visit:
- Which Z-score reference data were used, and was the result adjusted for height?
- Which sites were measured?
- Does the result change treatment, activity or nutrition?
- When, if ever, should the scan be repeated?
- Does my child need a bone health specialist?
Nutrition is often part of the conversation. Our article on vitamin D and bone density explains why measuring comes before supplementing. For a child, any vitamin D or calcium plan should come from the child's doctor.
Choosing where to have the scan
Where a child is scanned matters more than for an adult, for three reasons: pediatric reference data, staff experience with children, and a physician who reads the results in a pediatric context.
Before booking, ask:
| Question | Why it matters |
|---|---|
| Do you scan children, and from what age? | Policies vary by site and by the child's ability to stay still. |
| Do you use pediatric Z-score reference data? | Adult T-scores are not appropriate for growing bones. |
| Which sites do you measure? | The lumbar spine and total body less head are the preferred pediatric sites. |
| Who reads the report, and who receives it? | The ordering doctor should get it and review it with you. |
| Do you need a doctor's order for a minor? | Requirements for children can differ from adult self-referral. |
| What is the cash price for the exact scan? | A spine and total-body scan can be priced differently from a hip scan. |
If your child has a known condition or a fracture history, start with the specialist who manages it. Many children's hospitals run dedicated bone health programs, and the doctor can tell you whether a hospital or an outpatient center is the better fit. If your child's doctor says the scan can be done at an outpatient imaging center, the questions above help you choose one.
Our perspective
We built Dexascans around one idea: people should be able to see what a DEXA scan costs and where to get one without wading through hospital billing. For adults, that means comparing cash prices, scan types and locations across the country and booking directly with a clinic.
Children are a different case, and we say so plainly. A pediatric scan is only as useful as the interpretation behind it, which means pediatric reference data, a clinician who knows growing bones, and a doctor who sees the report. When parents come to us after a doctor has recommended a scan, the best thing we can offer is clarity: what the scan measures, what to ask a clinic and how to compare prices once you know the exact scan your child's doctor wants.
Accuracy is the reason DEXA is the standard tool here. It is a fast, low-dose, precise measurement, and that precision is worth protecting by choosing a site that is comfortable scanning kids. We list verified locations with source-backed pricing so you can start that conversation with a clinic informed, not guessing.
Erik
Find a DEXA clinic and compare cash prices
Once your child's doctor has told you which scan is needed, you can compare clinics by city or ZIP on Dexascans. Listings show the scan types offered and cash prices, so you can see costs before you call. Confirm directly with the clinic that they scan children, use pediatric reference data and will send the report to your child's doctor.
Start with our bone density test page for costs and how results work, or search clinics near you to compare options. If your child has had a fracture, our guide to bone density after a fracture explains how timing and results fit together.
FAQ
Why would a child need a bone density test?
A doctor may order one after recurrent or low-impact fractures, bone pain or deformity, or when a genetic disorder, chronic illness, immobility, poor nutrition or a bone-weakening medication is involved. The AAP says the scan helps estimate fracture risk, guides treatment and can monitor therapy. It is not a routine screening for healthy children.
Is there a minimum age for a DXA scan?
No universal minimum exists. The ISCD says DXA is appropriate even in infants and young children, and lumbar-spine measurements can be feasible from 0 to 5 years. In practice, a child must be able to lie still, and each facility sets its own policy, so ask before booking.
Can teens get a DEXA scan on their own?
Teens are scanned the same way as younger children, with Z-scores and pediatric reference data. Whether a clinic accepts a minor without a doctor's order depends on that clinic, so ask first. If the goal is checking bone health, talk with the pediatrician, who can say whether a scan is warranted.
Does a low Z-score mean my child has osteoporosis?
Not by itself. A Z-score of -2.0 or lower is described as low bone mineral mass or density. The ISCD says pediatric osteoporosis requires a significant fracture history as well, unless there is a vertebral compression fracture. Your child's doctor will weigh the scan together with growth, history and other findings.
How long does the scan take and is it safe?
Each scan takes about 1 to 3 minutes, though the full visit is longer with check-in and positioning. Radiation is very low, less than one-tenth of a standard chest X-ray. Your child can resume normal activities right away.
Sources
- Bone Densitometry in Children and Adolescents, Pediatrics (AAP)
- Pediatric Positions, ISCD
- Bone Density Testing, Pediatric Endocrine Society
- Dual Energy X-Ray Absorptiometry (DXA), Children's Hospital of Philadelphia
- Bone Density Scan (DXA) Clinical Pathway, Children's Hospital of Philadelphia
- Use of dual energy X-ray absorptiometry in pediatric patients, NCBI