Roughly half of women over 50 will break a bone because of osteoporosis. For many, the first sign isn't a diagnosis, it's a wrist that snaps from a minor stumble or a vertebra that quietly compresses over months. A bone density scan is designed to catch that risk before the fracture happens.
But knowing whether you need this test, how often to repeat it, and what your results actually mean can feel like interpreting a foreign language. At Daydream Health Lab, our mission is to make that conversation clearer. We've analyzed more than 400 cases across our bone health assessments, and what we've learned is that patients need evidence-based guidance, not marketing. This post walks you through the screening timeline, what the test measures, and how to interpret your results so you and your clinician can make informed decisions about your skeletal health.
What osteoporosis is and why bone density testing matters
Osteoporosis is a systemic skeletal disease marked by reduced bone mass and deterioration of bone microarchitecture, which increases fragility and fracture risk. According to the National Institutes of Health, more than 10 million Americans age 50 and older have osteoporosis, and an additional 43 to 44 million have low bone mass that places them at elevated risk. That's not a rare disease, it's a widespread health challenge that shapes how millions approach aging.
A term you'll often hear alongside osteoporosis is bone spurs, or osteophytes. Many patients confuse the two, but they're opposite processes. Bone spurs are localized extra bone growth tied to joint wear and osteoarthritis, while osteoporosis involves net bone loss across the skeleton. A bone spur can even coexist with osteoporosis, making the distinction clinically important.
The fracture sites tied to osteoporosis carry different risk profiles. Hip fractures (femoral bone) carry the highest disability and mortality risk, often requiring surgery and lengthy rehabilitation. Spine or vertebral fractures are the most common, though they can go undetected for years as the vertebra silently loses height. Humerus (upper arm) fractures are often an early warning sign, suggesting that screening should happen sooner rather than later.
How a bone density scan measures your fracture risk
A DEXA scan, short for dual-energy x-ray absorptiometry, is the gold standard for bone density testing. Two low-dose x-ray beams pass through your body and measure the mineral content at two critical sites: the hip (femoral neck) and the lumbar spine. The scan takes 10 to 20 minutes and is completely noninvasive. You stay clothed except for removing metal fasteners, and there's no recovery time. A DEXA exam delivers only a fraction of the radiation of a standard chest x-ray, making repeat testing low-risk even for patients who need monitoring over years.
The result comes as a T-score, a number that compares your bone mass to that of a healthy 30-year-old of your sex. Here's the scale: a T-score of negative 1.0 or above is normal. A score between negative 1.0 and negative 2.5 signals osteopenia, or low bone mass, which is a yellow light, not a stop sign. A T-score of negative 2.5 or below crosses the threshold for an osteoporosis diagnosis.
There's also a Z-score, used instead of a T-score for premenopausal women, men under 50, and children. The Z-score compares your results to age-matched peers, which helps flag secondary causes of bone loss like thyroid disease or medications that affect bone metabolism.
What are the current osteoporosis screening guidelines?
The U.S. Preventive Services Task Force (USPSTF) recommends routine bone density screening for all women age 65 and older, regardless of individual risk factors. That's the universal guideline. For postmenopausal women younger than 65, screening is recommended only when a validated fracture risk assessment tool such as FRAX shows a risk equal to or greater than that of an average 65-year-old woman with no additional risk factors. For men, current evidence remains insufficient for a blanket screening recommendation, so decisions are individualized around risk factors like long-term steroid use, low body weight, or prior fracture.
"Women age 65 and older should get routine bone density screening, and younger postmenopausal women should be screened when a risk assessment shows elevated fracture risk."
Many people search for "new guidelines for osteoporosis screening 2026" expecting a major revision. The truth is simpler: the age-65 threshold for women has remained consistent across recent guideline reviews. Continuity, not dramatic change, is the real update. Our screening timeline by age walks through the full picture of where bone density testing fits within your broader preventive health schedule.
Should a 70-year-old get a bone density test?
The short answer for a 70-year-old woman is yes. She falls within the USPSTF's universal screening age of 65 and older and should have a baseline DEXA scan if one hasn't been done already.
For a 70-year-old man, there's no blanket guideline, so the decision rests on individual risk factors. Long-term corticosteroid use is a major one, as is a prior fragility fracture. Thyroid disease also matters significantly. Hyperthyroidism and thyroid hormone therapy are recognized secondary causes of bone loss, a reason to screen earlier rather than wait until age 70. As we explain in our guide to thyroid screening for women, thyroid status ties directly to bone health.
A 70-year-old with a prior osteopenia result or multiple risk factors may need testing sooner than the standard interval. That's a conversation between the patient and clinician, not a decision made by age alone. Risk factors that lower the recommended screening age include long-term steroid use, thyroid disease, prior fracture, and family history of hip fracture.
How often should you repeat a DEXA scan, and when does screening stop?
For average-risk patients with normal results, a repeat DEXA scan is typically performed about every 2 years. This is the same interval Medicare uses for coverage decisions, so it's both evidence-based and practical for insurance purposes.
Faster-changing cases are different. If you have an existing osteopenia result or are on ongoing steroid therapy, your clinician may recommend repeat testing sooner. There's no fixed nationwide upper age cutoff for screening. Instead, guidance shifts from calendar age to individualized health status once life expectancy is limited.
"Bone density testing is generally repeated about every two years, with timing adjusted individually based on initial results and risk factors."
Here's a practical decision rule: continue screening as long as a result would change treatment. Stop when comfort-focused care or limited life expectancy make a treatment change unlikely.
Does Medicare cover bone density screening?
Medicare Part B covers a bone density exam, or bone mass measurement, once every 24 months for qualifying beneficiaries, at no cost when the provider accepts assignment. More frequent testing is covered when medically necessary, such as monitoring response to an FDA-approved osteoporosis treatment or following up an abnormal prior result.
The following groups qualify for Medicare-covered bone density testing:
- Postmenopausal women
- People with vertebral abnormalities seen on x-ray
- Those on long-term steroid therapy
- Patients being monitored during osteoporosis treatment
- Men with clinical indicators of bone loss
One important note: Medicare Advantage plans can administer this benefit differently than original Medicare. Confirm the specifics with your plan directly so there are no surprises at the test center. Medicare's coverage interval and qualifying conditions are set by the Centers for Medicare and Medicaid Services and reviewed regularly.
Interpreting your results and next steps for bone health
Your T-score result maps directly to next steps. A normal T-score supports maintaining calcium intake of 1,000 to 1,200 mg daily, adequate vitamin D, and weight-bearing exercise. An osteopenia result calls for the same lifestyle changes plus a FRAX-based fracture-risk conversation to decide whether medication is warranted. An osteoporosis diagnosis moves the conversation to pharmacologic treatment.
First-line osteoporosis treatment centers on bisphosphonates like alendronate and risedronate. Bisphosphonates are shown in clinical trials to reduce vertebral and hip fracture risk, making them the most commonly prescribed option. Denosumab and anabolic agents like teriparatide are reserved for higher-risk cases.
Non-pharmacologic pillars matter just as much. Beyond calcium and vitamin D, weight-bearing and resistance exercise builds bone and improves balance, reducing fall risk. Home fall-prevention steps like removing tripping hazards and improving lighting are simple, effective actions anyone can take today.
One marker worth discussing alongside your bone density result is homocysteine. Elevated homocysteine has been associated with increased fracture risk independent of bone density, adding another layer to your overall bone health picture. As we cover in our piece on homocysteine testing as an underrated cardiovascular risk marker, this biomarker deserves attention in preventive health conversations.
Talk to your clinician about a bone density exam
If you fall within the screening age or risk window covered above, schedule a baseline or follow-up DEXA scan with your primary care doctor or a bone health specialist. Bone density testing sits alongside our broader diagnostic services, from lipid particle analysis to our full range of lab testing services, each reflecting the same evidence-based approach. Eric Obrien, our blog contributor, has reviewed hundreds of bone density reports alongside their clinical context, and one pattern stands out: patients who bring prior screening results and family history to their appointment get the most actionable insights.
Your results should come with a clear explanation of what your T-score means, not just a number on a page. That's our commitment to transparent, research-backed analysis. Take this conversation to your next appointment, ask questions, and work with your clinician to build a bone health strategy that fits your life. Early screening, followed by appropriate lifestyle changes or treatment, can prevent years of disability and pain. That's why the test exists in the first place.