When Should You Get a DEXA Bone Density Scan? Osteoporosis Screening and Prevention

Bone Loss Usually Does Not Announce Itself

People tend to think about their bones after something goes wrong. A wrist fractures after a relatively minor fall. A vertebral compression fracture appears unexpectedly. A routine scan finally shows osteoporosis.

The biology started long before the diagnosis.

Bone is living tissue that is continuously being broken down and rebuilt. During younger adulthood, those processes are generally well balanced. With aging, hormonal changes, inactivity, inadequate nutrition, illness, certain medications, and other influences, bone breakdown can begin to outpace formation.

None of this necessarily produces symptoms. You cannot judge bone density by how strong someone looks, how much they exercise, or whether they feel well.

This is one reason bone health belongs in preventive medicine rather than being reserved for fracture care.

When Should You Get a DEXA Bone Density Scan?

The 2025 U.S. Preventive Services Task Force recommendation calls for osteoporosis screening in women age 65 and older. It also recommends screening postmenopausal women younger than 65 when clinical risk assessment indicates increased fracture risk.

That does not mean everyone should simply wait until their 65th birthday.

A clinician may consider earlier bone-density evaluation when there are reasons to suspect accelerated bone loss or increased fracture risk, including a history of fracture, low body weight, early menopause, significant hormone deficiency, prolonged glucocorticoid use, certain chronic diseases, nutritional problems, or a strong family history of osteoporosis or hip fracture.

For men, routine population-wide screening is less clearly defined. The USPSTF currently considers the evidence insufficient to recommend for or against universal screening in men. That is different from saying that men do not develop osteoporosis. Men with relevant clinical risk factors may still warrant evaluation.

Why Testing Before 65 May Make Sense

A screening guideline has to address an entire population. An individual patient has a history.

Consider a woman who enters menopause early, has a small frame, has lost substantial weight, takes a medication known to affect bone, or has a mother who fractured a hip. Waiting for an arbitrary age threshold may not make much sense.

The same applies to someone whose health has changed significantly. Major weight loss, prolonged inactivity, nutritional deficiencies, gastrointestinal disease, changes in sex hormones, and other medical circumstances can alter the bone-health calculation.

A baseline can also be useful when future change is likely to matter. Bone density is most informative when the result can influence what happens next, whether that means further evaluation, changes in exercise or nutrition, correction of a secondary cause, closer monitoring, or medical treatment when appropriate.

What DEXA Actually Tells You

DEXA bone density testing measures bone mineral density at clinically important skeletal sites, commonly including the lumbar spine and hip.

Reports may include a T-score, a Z-score, or both depending on age and clinical circumstances.

A T-score compares bone density with a young-adult reference population. In postmenopausal women and men age 50 and older, a T-score of -2.5 or below at an appropriate diagnostic site is consistent with osteoporosis. Values between -1.0 and -2.5 are commonly described as low bone mass or osteopenia.

A Z-score compares bone density with what would be expected for someone of similar age and sex. It is particularly useful in younger adults, where a T-score may not be the most appropriate way to interpret the result.

The number still needs context. A DEXA report does not know whether someone recently entered menopause, has been taking prednisone, fractured a hip previously, has low vitamin D, is under-fueled, has lost significant muscle, or has another medical condition affecting bone.

The scan measures bone. Clinical interpretation explains the person attached to the scan.

Menopause Changes the Bone Equation

For women, the menopausal transition deserves particular attention because declining estrogen can accelerate bone turnover and bone loss.

This is not limited to women who already have osteoporosis. Changes in bone remodeling begin during the menopausal transition, which is why fracture prevention should not begin only after a DEXA report crosses a diagnostic threshold.

Women interested in this relationship can read our detailed guide to estrogen, menopause, bone density, and osteoporosis risk.

Hormone therapy can also affect bone density, but the decision to use menopausal hormone therapy involves much more than a DEXA result. Symptoms, age, time since menopause, medical history, cardiovascular risk, breast health, personal preferences, and the overall treatment plan all belong in that discussion.

Muscle and Bone Age Together

Bone health is often discussed as if the skeleton were operating independently from everything around it. It is not.

Muscle places mechanical load on bone. Walking, resistance training, impact activity when appropriate, and ordinary physical movement provide signals that help maintain skeletal strength. Losing muscle and strength can also increase fall risk, making an already vulnerable skeleton more likely to be injured.

This is one reason DEXA can be particularly useful in longevity medicine. Depending on the examination performed, the technology can assess both bone mineral density and whole-body composition. At HormoneSynergy®, our Hologic® DEXA testing includes bone density along with measurements of lean mass, body fat distribution, and visceral fat.

That creates a much more useful conversation than bone density alone. Someone can have acceptable body weight while quietly losing both bone and muscle. Another person may be losing weight successfully but sacrificing more lean tissue than intended.

Osteoporosis Prevention Is More Than Calcium

Calcium and vitamin D matter, but reducing osteoporosis and fracture risk is broader than taking two nutrients.

Bone-health planning may include adequate protein and overall nutrition, weight-bearing activity, progressive resistance training, vitamin D evaluation when appropriate, sufficient calcium intake, smoking avoidance, moderation of alcohol, attention to fall risk, and investigation of medical or hormonal factors that may be accelerating bone loss.

Some people will also need medication. Osteoporosis treatment has expanded considerably, and the appropriate choice depends on fracture history, bone density, overall fracture risk, age, medical history, kidney function, previous treatment, and other clinical considerations.

The first job is figuring out who is actually at risk.

Bone Density in Longevity Medicine

Longer life without mobility and physical independence is not much of a longevity strategy.

A hip fracture in later life can alter mobility, independence, and overall health remarkably quickly. Preserving the skeleton is therefore part of preserving healthspan alongside cardiovascular health, metabolic health, cognition, muscle, and physical capacity.

Our broader article on bone density, hormones, and longevity looks more closely at the physiology connecting the skeleton with estrogen, testosterone, muscle, and aging.

For the larger preventive framework, see Longevity Medicine: A Preventive Guide to Healthspan, Diagnostics, and Healthy Aging.

DEXA Testing at HormoneSynergy®

HormoneSynergy® offers Hologic® DEXA bone-density and body-composition testing in Lake Oswego, Oregon, for both established patients and people who simply want a stand-alone scan.

The goal is straightforward: obtain objective information about bone, muscle, and body composition while there is still time to use it.

Learn more about DEXA bone density, body composition, and visceral fat testing.

Frequently Asked Questions

At what age should women get a bone density scan?

Current U.S. preventive guidance recommends osteoporosis screening for women age 65 and older. Postmenopausal women younger than 65 should be evaluated for osteoporosis risk, with DEXA screening recommended when clinical risk assessment indicates increased fracture risk.

Should women wait until age 65 if they have osteoporosis risk factors?

Not necessarily. Earlier evaluation may be appropriate when factors such as early menopause, previous fracture, low body weight, certain medications, family history, hormone deficiency, or medical conditions increase concern about bone loss.

Do men need bone density testing?

Men can develop osteopenia and osteoporosis. The USPSTF currently finds insufficient evidence to recommend routine screening of all men, but individual men with clinical risk factors may still warrant DEXA evaluation.

Can you have osteoporosis without symptoms?

Yes. Bone loss usually causes no symptoms until a fracture or vertebral compression occurs, which is one reason screening can be valuable in people at increased risk.

What is the difference between a T-score and a Z-score?

A T-score compares bone density with a young-adult reference population and is commonly used for osteoporosis diagnosis in postmenopausal women and men age 50 and older. A Z-score compares bone density with an age-matched reference population and is often more useful in younger people.

Can DEXA measure muscle and body fat too?

Whole-body DEXA can provide measurements of lean mass, fat mass, body-fat distribution, and visceral fat in addition to dedicated bone-density testing. The exact information available depends on the examination and equipment used.

Clinical References

• U.S. Preventive Services Task Force: Osteoporosis Screening to Prevent Fractures
• International Society for Clinical Densitometry: Official Adult Positions
• Bone Health & Osteoporosis Foundation: Osteoporosis Prevention

This article is for educational purposes and is not a substitute for individualized medical care. Decisions about bone-density testing, fracture-risk assessment, hormone therapy, nutrition, exercise, or osteoporosis treatment should be based on personal medical history and clinical evaluation.