Osteoporosis Screening: Understanding Bone Density Testing and Prevention

. The article presented bone-density screening for men at age 70 as a recommendation. It is not one: the U.S. Preventive Services Task Force finds the evidence insufficient to weigh the benefits and harms of screening men, though some specialty organizations do suggest testing at 70 and older. The passages have been corrected to describe testing in men as an individual decision, and the recommendation for postmenopausal women under 65 at increased fracture risk has been stated alongside the recommendation for women 65 and older.

Your bones constantly rebuild themselves throughout your life. In healthy bones, old bone is removed and new bone is added in a balanced cycle. Osteoporosis develops when this balance shifts—more bone is lost than replaced—leaving bones porous, weak, and prone to breaking from minor falls or even everyday activities like bending or coughing.

Osteoporosis is often called a "silent disease" because bone loss happens gradually without symptoms until a fracture occurs. Many people discover they have osteoporosis only after breaking a bone in their wrist, spine, or hip. These fractures can cause lasting pain, disability, and loss of independence, especially in older adults.

Osteoporosis screening uses simple tests to measure bone density before fractures happen. When weak bones are identified early, you and your doctor can take steps to slow bone loss, strengthen bones, and reduce fracture risk. Knowing when to get screened and what the results mean helps you protect your bone health for the long term.

Who Should Be Screened for Osteoporosis

Screening recommendations are based on age, sex, and individual risk factors. Women 65 years and older should be screened because bone loss accelerates after menopause when estrogen levels drop. Screening in men is less settled, and it is worth being clear about why. Age-related bone loss does affect men, typically later than in women, and several specialty organizations suggest bone density testing for men at 70 and older. The U.S. Preventive Services Task Force, however, has concluded that the current evidence is insufficient to weigh the benefits and harms of screening men for osteoporosis, and so makes no recommendation either way. In practice this means testing in men is an individual decision made with a physician, weighed against fracture risk factors, rather than a routine age-based screen.

Younger adults may need earlier screening if they have risk factors for bone loss. These include a previous fracture from minor trauma, long-term use of certain medications (especially corticosteroids like prednisone), conditions that affect bone health (such as rheumatoid arthritis, chronic kidney disease, or overactive thyroid), low body weight, smoking, excessive alcohol use, or a family history of osteoporosis or hip fracture. Women who experience early menopause (before age 45) also have increased risk.

Postmenopausal women under 65 may benefit from screening based on their fracture risk. Your doctor can use risk assessment tools that consider multiple factors to determine whether screening is appropriate for you. If you're unsure whether you need screening, discuss your personal risk factors with your physician.

Understanding Bone Density Testing

The standard test for osteoporosis screening is called dual-energy x-ray absorptiometry, or DXA (sometimes called DEXA). This test uses low-dose x-rays to measure bone mineral density, typically at the hip and spine—two areas where fractures have the greatest impact on health and independence. The test is painless, non-invasive, and usually takes 10 to 20 minutes. You lie on a padded table while a scanning arm passes over your body.

Your results are reported as two scores. The T-score compares your bone density to that of a healthy 30-year-old adult of the same sex—the age when bone density is typically highest. A T-score of -1.0 or above is considered normal. A T-score between -1.0 and -2.5 indicates low bone mass (sometimes called osteopenia), meaning bones are weaker than normal but not yet osteoporotic. A T-score of -2.5 or lower indicates osteoporosis. The Z-score compares your bone density to what's expected for someone of your age, sex, and size, which can help identify if bone loss is greater than expected for your age.

Some screening may be done using other methods, such as ultrasound of the heel bone, but DXA of the hip and spine remains the preferred method for diagnosis and monitoring. If initial screening suggests low bone density, your doctor will determine the best follow-up testing and treatment plan.

What Affects Bone Health

Many factors influence bone strength throughout life. Adequate calcium and vitamin D are essential—calcium provides the building blocks for bone, while vitamin D helps your body absorb calcium. Weight-bearing and muscle-strengthening exercise stimulates bone formation and maintains bone density. Activities like walking, jogging, dancing, climbing stairs, and lifting weights are particularly beneficial.

Several factors can weaken bones. Smoking interferes with the body's ability to use calcium and reduces estrogen levels in women. Heavy alcohol consumption (more than two drinks per day) can interfere with calcium absorption and bone formation. Certain medications, especially corticosteroids taken long-term, can accelerate bone loss. Medical conditions affecting hormones, nutrient absorption, or inflammation can also impact bone health.

Genetics play a significant role—if your parents had osteoporosis or hip fractures, your risk increases. Body size matters too: people with small, thin frames have less bone mass to begin with and may be at higher risk. Race and ethnicity influence risk as well, with white and Asian individuals generally at higher risk than Black and Hispanic individuals, though osteoporosis can affect anyone.

Preventing Bone Loss

Bone health begins early in life, but it's never too late to protect your bones. Adults generally need 1,000 to 1,200 milligrams of calcium daily, which can come from dairy products, leafy green vegetables, fortified foods, or supplements if dietary intake is insufficient. Vitamin D needs vary, but most adults require 600 to 800 international units daily, obtained through sunlight exposure, fortified foods, fatty fish, or supplements.

Regular physical activity is crucial for maintaining bone density and strength. Aim for at least 30 minutes of weight-bearing exercise most days of the week. Activities that challenge your balance also help prevent falls, which are the primary cause of fractures in people with osteoporosis. Resistance training with weights or bands helps maintain both bone and muscle strength.

Avoid smoking and limit alcohol consumption. If you take medications that can affect bone health, discuss this with your doctor—sometimes alternative treatments are available, or preventive measures can be added. Review your home environment to reduce fall risks: remove loose rugs, improve lighting, install grab bars in bathrooms, and ensure walkways are clear. Falls prevention is a key part of fracture prevention.

After Your Screening Results

If your screening shows normal bone density, you and your doctor will determine when you need repeat testing—typically every two years for those at higher risk, or less frequently for those with normal results and no risk factors. Continue preventive measures to maintain bone health.

If results show low bone mass or osteoporosis, your doctor will develop a treatment plan tailored to your situation. This may include optimizing calcium and vitamin D intake, starting an exercise program, addressing modifiable risk factors like smoking, and possibly beginning medication to slow bone loss or promote bone formation. Several effective medications are available, each with different mechanisms, benefits, and considerations.

Follow-up testing schedules depend on your initial results and treatment plan. If you start medication, repeat DXA scans are typically done every one to two years to monitor treatment effectiveness. Your doctor may also check for underlying conditions that contribute to bone loss, such as vitamin D deficiency, thyroid problems, or celiac disease. Regular follow-up ensures your bone health strategy remains effective as your needs change over time.

Your Bone Health Checklist

• Discuss screening with your doctor if you are a woman 65 or older, a postmenopausal woman under 65 with risk factors, or a man weighing testing with your physician
• Get adequate calcium (1,000-1,200 mg daily) from food or supplements
• Ensure sufficient vitamin D (600-800 IU daily) through sunlight, diet, or supplements
• Engage in weight-bearing exercise (walking, jogging, dancing) at least 30 minutes most days
• Add resistance training with weights or bands 2-3 times per week
• Avoid smoking and limit alcohol to no more than one drink daily for women, two for men
• Review medications with your doctor to identify any that may affect bone health
• Make your home safer by removing fall hazards and improving lighting

When to Contact a Clinician

Contact your doctor to discuss osteoporosis screening if you are approaching or past the recommended screening age, have experienced a fracture from a minor fall or injury, have lost height or noticed a stooped posture, take corticosteroids or other medications that affect bone health, or have medical conditions or a family history that increases fracture risk. If you've been diagnosed with low bone mass or osteoporosis, maintain regular follow-up appointments to monitor your bone health and adjust your treatment plan as needed.

Questions to Ask at a Medical Visit

• Based on my age and risk factors, do I need bone density screening now?
• What is my T-score, and what does it mean for my fracture risk?
• Should I be taking calcium and vitamin D supplements, and if so, how much?
• What types of exercise are safest and most beneficial for my bone health?
• Do any of my current medications increase my risk of bone loss?
• If I have low bone density, what treatment options are available, and what are the benefits and risks?
• How often should I have follow-up bone density testing?

Main Takeaway

Osteoporosis screening is a simple, painless test that can identify weak bones before a serious fracture occurs. Women 65 and older, and postmenopausal women under 65 with increased fracture risk, should be screened. Men should discuss testing individually with their doctor, since the evidence on routine screening in men is insufficient to support an age-based recommendation. Early detection combined with calcium, vitamin D, regular exercise, and lifestyle modifications can help maintain bone strength and independence throughout your life. If screening reveals low bone density, effective treatments are available to reduce fracture risk and protect your long-term health.

References and Further Reading

• U.S. Preventive Services Task Force — Screening for osteoporosis to prevent fractures
• National Osteoporosis Foundation — Bone density testing and osteoporosis screening guidelines
• American College of Obstetricians and Gynecologists — Osteoporosis screening and prevention in women
• Endocrine Society — Calcium and vitamin D recommendations for bone health
• Centers for Disease Control and Prevention — Physical activity recommendations and fall prevention

Related Articles

• Fall Prevention: Practical Steps to Stay Safe and Independent
• Adult Preventive Examinations