July 15, 2026
Osteoporosis is often called a “silent” disease because you won’t know you have it without a test or until a bone breaks.1 That’s why screening is crucial, especially if you have risk factors. The main test for osteoporosis is a bone density scan, usually done by a machine called DXA (dual-energy x-ray absorptiometry).2 It’s a quick, painless scan (similar to an x-ray with very low radiation) that measures the thickness of your bones, typically at the hip and spine . This measurement tells you your bone mineral density (BMD) and compares it to normal values. The result is given as a T-score, which shows how far your bone density is above or below that of an average healthy young adult. A T-score of 0 means your bone density is average for a young adult; a negative score means your bones are less dense. Osteoporosis is defined by a T-score of -2.5 or lower, meaning your bones are much thinner than normal. For example, a T-score of -3.0 falls in the osteoporosis range. If your T-score is between -1.0 and -2.5, it indicates osteopenia (low bone mass, a step before osteoporosis).3
Who should get a bone density test? Doctors have clear guidelines for this. In general, all women age 65 and older should have a DXA scan. Postmenopausal women under 65 should be screened if they have significant risk factors (like a history of fractures, long-term steroid use, very low body weight, etc.).3 Men age 70 and older are also advised to get a bone density test, since osteoporosis in men often goes undiagnosed until a fracture occurs.4 Men between 50 and 69 might need testing if they have risk factors for bone loss.3 Additionally, anyone over 50 who breaks a bone should be considered for a bone density test.3 A fracture from a minor incident can be a red flag for underlying osteoporosis.
Getting a DXA scan is straightforward. You lie on a padded table while the machine scans your hip and spine; it’s not enclosed like an MRI, so it’s not claustrophobic. The test usually takes only 10-15 minutes.5 Afterward, you’ll receive a report with your bone density results. Your healthcare provider will explain what your T-scores mean for your bone health.5 If your results show osteopenia or osteoporosis, that doesn’t mean a fracture is inevitable, but it does indicate that you and your doctor should take steps to protect your bones (through lifestyle changes and possibly medications).
Other tools and tests: In some cases, a different type of scan (such as a quantitative CT scan) may be used, but DXA is the standard because of its accuracy and low radiation.6,7 Portable ultrasound devices can measure bone density in the heel as a quick screening method, for example at health fairs or some pharmacies. However, an abnormal ultrasound screening should always be confirmed with a DXA scan for diagnosis, as ultrasound is not as precise in predicting fracture risk.3,7 Doctors may also use fracture risk calculators, like the FRAX tool developed by the World Health Organization. FRAX takes into account your bone density (if available) plus clinical risk factors (age, sex, weight, family history, etc.) to estimate your chance of breaking a bone in the next 10 years. This can help guide decisions, especially if you’re in the osteopenia range – for instance, a high FRAX risk might prompt starting medication even if your T-score isn’t yet -2.5.8
More information about FRAX is available here: https://www.osteoporosis.foundation/sites/iofbonehealth/files/2020-04/FRAX-Identifying-People-At-High-Risk-of-Fractures.pdf
Regular follow-up: If you’re diagnosed with osteoporosis or osteopenia, your doctor will likely repeat the bone density test every 1-2 years to monitor any changes.3 This helps track whether treatment is improving your bone density or if the condition is progressing. It’s important to have your scans on the same machine or at least the same facility when possible, for consistency. Remember that bone density is just one part of the picture: it doesn’t capture everything about bone strength, but it’s a very useful indicator. Together with your risk factors, it allows you and your healthcare team to make informed decisions about prevention and treatment.
In summary, screening for osteoporosis with bone density tests can catch the disease early, before a fracture happens. If you’re at the recommended age or have risk factors, talk to your doctor about getting tested. Knowing your bone health status is empowering: it’s the first step toward taking action and keeping your bones as strong as possible.
FAQ
1. What is a bone density test and why is it important?
A bone density test measures bone strength and helps detect osteoporosis early, reducing the risk of fractures.
2. What is the most common test for osteoporosis?
The DXA scan (dual-energy X-ray absorptiometry) is the standard test for measuring bone mineral density.
3. Who should get a bone density test?
Women 65+, men 70+, and adults over 50 with risk factors or fractures should consider screening.3
4. How does a DXA scan work?
It uses low-dose X-rays to measure bone density at the hip and spine, taking about 10 to 15 minutes.5
5. What do T-scores mean in bone density results?
A T-score of 0 is normal; -1.0 to -2.5 indicates osteopenia; -2.5 or lower means osteoporosis.3
6. Is a bone density test painful or risky?
No, it’s quick, painless, and uses very low radiation, similar to an X-ray.
7. How often should you repeat a bone density test?
Every 1–2 years if you have osteoporosis or osteopenia, or as recommended by your doctor.3
8. Can men get osteoporosis and need screening?
Yes. Men 70+ or those 50–69 with risk factors should be tested.3
9. What is the FRAX tool and how is it used?
FRAX estimates your 10-year fracture risk using bone density and clinical factors.8
This article was written with the assistance of generative AI technology and reviewed for accuracy.
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