Do You Need a Bone Density Scan Before 65? The Two-Step Check That Decides

October is the month of pink ribbons and mammogram reminders, and the bone equivalent gets far less airtime. According to the Bone Health & Osteoporosis Foundation, about one in two women over 50 will break a bone because of osteoporosis, and a woman's risk of breaking a hip equals her combined risk of breast, uterine and ovarian cancer. The fracture is rarely the end of the story, either: the U.S. Preventive Services Task Force notes that only 40% to 60% of people who break a hip get back to their earlier level of mobility and independence in daily activities. World Osteoporosis Day falls on October 20, and this year's International Osteoporosis Foundation campaign is built around building, protecting and strengthening bones across a whole life. What the campaign slogans skip is the practical question many women are left holding in their 40s and 50s: when, exactly, do you need a bone density scan, and who decides?

What the federal guidance says, and what it leaves out

The reference point is a recommendation statement the Task Force published on January 14, 2025. It calls for osteoporosis screening in all women 65 and older and in postmenopausal women younger than 65 who are at increased risk of fracture, and it gives both a B grade, its label for moderate net benefit. For men the evidence was judged insufficient (a grade I). The statement applies to adults 40 and older who have no existing osteoporosis diagnosis and no history of fragility fractures, meaning breaks from a fall at standing height or lower, and it describes itself as otherwise consistent with the 2018 version, with one clarification: screening means a central DXA bone density test, with or without a fracture risk assessment. The same document puts osteoporosis at 19.6% of U.S. women 50 and older and 27.1% of women 65 and older. What the statement does not say is just as useful. There is no instruction to scan every woman at menopause or at 50, and that gap is where most of the confusion starts.

The two-step check for women under 65

Being postmenopausal is the entry ticket, not the whole decision.

For postmenopausal women younger than 65, the Task Force suggests a sequence. First, a clinician looks for risk factors beyond menopause itself. Second, if there is at least one, a clinical risk assessment tool estimates whether the risk is high enough to justify a scan, and only women who land in the increased-risk group go on to DXA. FRAX, the most studied of them, estimates the 10-year probability of a hip fracture or a major osteoporotic fracture (hip, spine, wrist or shoulder) for people aged 40 to 90, while the Osteoporosis Self-assessment Tool (OST) and the Osteoporosis Risk Assessment Instrument (ORAI) need fewer inputs and are built to flag who probably has osteoporosis. Country-specific versions of FRAX exist, so if you live outside the U.S., ask for the one calibrated to your own country's fracture data.

The risk factors the Task Force names are short enough to memorize:

Other conditions and medicines, such as corticosteroids or insulin-treated diabetes, also raise risk, and women whose osteoporosis is already caused by an underlying illness or long-term medication fall outside this recommendation altogether. If even one item on the list applies to you on top of menopause, ask at your next routine visit for a FRAX or similar calculation instead of waiting for your 65th birthday.

The system has a known flaw, and the Task Force says so itself. The U.S. versions of FRAX are calibrated by race and ethnicity, so for Asian, Black and Hispanic women the predicted risk will always come out lower than for a White woman with identical age, weight, bone density and risk factors, even though the Task Force acknowledges that differences in bone density alone do not explain the differences in fracture rates. It suggests that clinicians may reasonably avoid applying treatment cutoffs mechanically for exactly that reason. If you belong to one of those groups and your score lands just under the line, "you're below the threshold" is where the conversation should start, not end.

What a DXA scan can and cannot tell you

A DXA scan passes a low-dose X-ray scanner over you while you lie on a cushioned table, and the National Institutes of Health describes it as quick, painless and noninvasive. The central version, measured at the hip and the lumbar spine, is considered the most reliable way to diagnose osteoporosis and predict fracture risk. Your result comes back as a T-score, which compares your bone density with that of a young, healthy reference population, and osteoporosis is defined as a T-score of -2.5 or lower, a threshold the World Health Organization set in 1994. Here is the catch: the Task Force points out that most fragility fractures happen in people whose T-scores sit above -2.5, and that advancing age is a stronger determinant of fracture than bone density. Older adults break bones at much higher rates than younger adults with the same density, because bone quality declines and the likelihood of falling rises. A normal or borderline result is therefore a snapshot of one risk factor, not a clearance certificate.

Insist on a central DXA of the hip and spine. A portable heel or wrist scan is a different test: NIAMS says peripheral DXA results may not help predict future fractures or monitor medication, and a heel ultrasound that suggests bone loss still has to be confirmed with a DXA before anyone can diagnose osteoporosis.

How often to repeat it, and who pays

More scans do not mean more certainty. In the cohort studies the Task Force reviewed, repeating a bone density test at intervals of four to eight years added no accuracy in predicting fractures. How quickly a woman crosses into osteoporosis depends on where she starts: in the studies the Task Force cites, it took almost 17 years for 10% of women with normal bone density to develop osteoporosis, versus about five years for women whose baseline T-score fell between -1.50 and -1.99. A woman with a normal scan at 55 is not due for a yearly repeat, while one with a borderline result should expect her clinician to want a shorter interval.

The cost rules below are American; elsewhere, check with your national health service or insurer. Medicare Part B pays for a bone mass measurement once every 24 months, or more often when medically necessary, if you meet at least one condition, such as being a woman whose doctor determines she is estrogen-deficient and at risk, or having X-rays that show possible osteoporosis, osteopenia or vertebral fractures. You pay nothing if the provider accepts assignment. For women with private insurance, HealthCare.gov lists bone density screening for women over 65 and for postmenopausal women 64 and younger among covered preventive services, generally at no cost when the provider is in network, with the caveat that $0 is not guaranteed in all cases. Call the plan before booking and ask whether the scan would be billed as preventive screening.

One Medicare change is timed for this week. National coverage of biomechanical CT, a method that analyzes an existing hip or spine CT scan to estimate bone strength as well as density, was scheduled to take effect on October 5, 2026, retroactive to January 1, 2024, Medscape reported. The test is currently available only through its developer, O.N. Diagnostics, whose founder Tony Keaveny reported holding equity in the company. John Schousboe of the University of Minnesota told Medscape it adds value mainly for people who had a CT for another reason and never had a density test, and JoAnn Pinkerton of the University of Virginia noted that Medicare will not pay for two tests for the same diagnosis, so DXA remains the first choice for most patients.

What helps your bones whether or not you get scanned

Strength training sits at the top of the evidence list. NIAMS says the best physical activities for bone health include strength or resistance training, that exercise can make bones stronger through childhood and adulthood, and that in older adults it stops adding bone mass but still builds muscle, balance and coordination, which lowers the odds of a fall. A progressive routine with weights, resistance bands or heavier bodyweight work is a better use of the next three months than a shelf of supplements.

Calcium and vitamin D need a more careful read than the supplement aisle suggests. The recommended daily amounts are 1,000 mg of calcium for women 19 to 50 and 1,200 mg from 51 on, with 600 IU of vitamin D to age 70 and 800 IU after that, according to NIAMS, and the Task Force stresses that those amounts count food, drinks and supplements together. Its 2018 recommendation advised against taking 400 IU or less of vitamin D with 1,000 mg or less of calcium to prevent fractures in postmenopausal women. A December 2024 draft, still listed as in progress on the Task Force's site, would go further and advise against vitamin D with or without calcium for that purpose in community-dwelling postmenopausal women and men 60 and older. Those statements exclude anyone with an osteoporosis diagnosis, a past osteoporotic fracture or vitamin D deficiency, so they do not apply to everyone. Get calcium from the table first: NIAMS lists dairy products, bok choy, collards, broccoli, sardines and salmon eaten with their bones, and calcium-fortified soy milk or tofu.

Hormone therapy belongs in the conversation too. The Bone Health & Osteoporosis Foundation says estrogen, or estrogen with progesterone, prescribed for menopausal symptoms can also help prevent bone loss, but some women are advised against it because of possible risks that include breast cancer, stroke and blood clots. Whether bone protection tips the decision depends on your symptoms and your personal risks, and that call belongs to you and your clinician together.

Before your next appointment

None of this requires waiting for an awareness date. Write down a few things first:

Of the Task Force's risk factors, a parent's hip fracture is the one only you can supply, so it is worth asking your relatives before the appointment rather than during it.