You cannot feel osteoporosis developing, so diagnosis requires a bone density test

Osteoporosis has no symptoms in its early stages. You will not feel weak bones, and there is no pain or visible sign that bone density is dropping. Many people discover they have osteoporosis only after a fracture happens — a fall that breaks a hip, wrist, or spine when it would not have broken a younger person's bone. This is why screening matters: a bone density test can show low bone mass before a break occurs.

The standard test is called a DXA scan (dual-energy X-ray absorptiometry). It takes about 10 to 30 minutes, uses a very small amount of radiation — less than a chest X-ray — and measures how much mineral is packed into your bones. The scan compares your bone density to that of a healthy 30-year-old adult and gives you a T-score. That score tells your doctor whether your bones are normal, show early bone loss (called osteopenia), or have osteoporosis.

A DXA scan is painless. You lie on a table fully clothed while a scanner passes over your hip, spine, and sometimes your forearm. You do not need to undress, fast, or prepare in any special way. Your doctor will order the scan at a hospital, imaging center, or bone health clinic.

Key Takeaways

  • Osteoporosis causes no pain or symptoms until a bone breaks, so a DXA scan is the only way to know your bone density before injury.
  • A T-score of –2.5 or lower on a DXA scan means you have osteoporosis; a score between –1 and –2.5 means early bone loss.
  • Women over 65 and men over 70 should have a DXA scan; younger people with risk factors (family history, certain medications, low body weight) may need one sooner.
  • A broken bone from a minor fall, loss of height, or a stooped posture can be a sign that osteoporosis is already present.
  • Your doctor uses your T-score plus your age, sex, and other health factors to decide whether treatment is needed.

What a DXA scan result means: T-scores explained

Your DXA result comes back as a T-score — a number that compares your bone density to a healthy young adult's. The scale runs from positive to negative. A T-score of –1 or higher is considered normal bone density. A score between –1 and –2.5 means you have osteopenia, which is early bone loss but not yet osteoporosis. A T-score of –2.5 or lower means you have osteoporosis.

The lower your T-score, the weaker your bones are and the higher your fracture risk. For example, a T-score of –1.5 means your bones are thinner than normal but still relatively strong. A T-score of –3 or lower means significant bone loss and much higher risk of breaking a bone from a fall or even a bump. Your doctor will discuss what your specific score means for your body and whether you need treatment.

Some imaging centers also give you a Z-score, which compares your bone density to others your same age and sex. The T-score is what matters most for diagnosis, but the Z-score can help your doctor understand whether your bone loss is typical for your age or faster than expected.

Signs that osteoporosis may already be present

If you have not had a DXA scan, certain physical changes can signal that bone loss is already advanced. A sudden loss of height — more than an inch or two over a few years — often means one or more vertebrae in your spine have fractured without you feeling it. These are called compression fractures, and they happen silently when weakened bones collapse under your own weight.

A stooped or rounded upper back, sometimes called a dowager's hump, is another sign. This posture develops when multiple spine fractures stack up and cause the upper spine to curve forward. You may notice your clothes fit differently or that you cannot stand as straight as you used to.

A fracture from a minor fall — breaking a hip, wrist, or spine from a slip on the stairs or a tumble from standing height — is a red flag. Healthy bones can usually absorb that kind of impact. If you break a bone easily, your doctor will want to check your bone density right away, even if you have never had a DXA scan before.

Chronic back or neck pain, especially pain that gets worse when you bend forward, can also point to spine fractures. Not all back pain means osteoporosis, but if it is new and you are over 50, mention it to your doctor.

Who should have a DXA scan and when

Medical organizations recommend that all women age 65 and older have a DXA scan, and all men age 70 and older. If you are younger but have risk factors, your doctor may suggest screening sooner. Risk factors include a family history of osteoporosis or hip fracture, a body weight below 127 pounds, use of corticosteroid medications (like prednisone) for more than three months, rheumatoid arthritis, or a personal history of fracture as an adult.

Women who have gone through menopause but are under 65 should talk to their doctor about whether screening makes sense for them. Menopause causes a sharp drop in estrogen, which speeds bone loss, so some women in their 50s benefit from knowing their bone density.

If you have already had a DXA scan, your doctor will tell you when to repeat it. For people with normal bone density, repeat scans are often done every 10 years. For those with osteopenia, scans may happen every 1 to 2 years to watch for faster bone loss. People being treated for osteoporosis may have scans every 2 years to see whether treatment is working.

Other tests that support a bone density diagnosis

Your doctor may order blood or urine tests alongside a DXA scan. These tests measure bone turnover markers — substances your body releases when bone is breaking down faster than it is being built. High turnover can mean you are losing bone quickly and may benefit from treatment sooner.

Blood tests can also check your vitamin D level, calcium level, and kidney and liver function. Vitamin D is essential for bone health, and many people over 50 have low levels. If your vitamin D is low, your doctor will likely recommend a supplement before or along with osteoporosis treatment.

If you have had a fracture, your doctor may order an X-ray to see the break and check whether your spine shows signs of old fractures you did not know about. An X-ray cannot measure bone density the way a DXA scan can, but it can reveal damage.

What happens after diagnosis

If your DXA scan shows osteoporosis, your doctor will not automatically start you on medication. Instead, they will consider your age, sex, T-score, and personal fracture risk. Some people with a T-score of –2.5 may not need medicine right away if their fracture risk is low. Others with a higher T-score but multiple risk factors may benefit from treatment sooner.

Your doctor may use a tool called the FRAX calculator, which combines your bone density score with other health information to estimate your 10-year risk of a major fracture. This helps guide the decision about whether to start treatment or focus first on lifestyle changes like weight-bearing exercise, calcium and vitamin D intake, and fall prevention.

If you have osteopenia (early bone loss), your doctor will usually recommend monitoring your bone density over time rather than starting medicine. The focus is on slowing bone loss through exercise, nutrition, and fall prevention.

Preparing for a DXA scan

A DXA scan requires almost no preparation. Wear loose, comfortable clothing without metal buttons, zippers, or snaps — these can interfere with the image. Remove jewelry, watches, and any metal objects from your pockets. You do not need to fast or stop taking medications.

If you are pregnant or think you might be, tell the imaging center before the scan. DXA uses radiation, and although the dose is very small, it is safer to avoid during pregnancy.

Bring your insurance card and photo ID. The scan usually takes 10 to 30 minutes from start to finish. You will get results within a few days, and your doctor will discuss them with you and explain what they mean for your health.

Frequently Asked Questions

Can you feel osteoporosis in your bones?

No. Osteoporosis causes no pain, stiffness, or sensation until a bone breaks. Many people have significant bone loss and do not know it. This is why a DXA scan is important — it finds the problem before a fracture happens.

What is the difference between osteoporosis and osteopenia?

Osteopenia is early bone loss; a T-score between –1 and –2.5. Osteoporosis is more advanced; a T-score of –2.5 or lower. Both mean your bones are thinner than normal, but osteoporosis carries much higher fracture risk. Osteopenia is often managed with lifestyle changes; osteoporosis may need medication.

How often do I need a DXA scan?

If your bone density is normal, every 10 years is typical. If you have osteopenia, every 1 to 2 years helps track whether bone loss is speeding up. If you have osteoporosis and are being treated, every 2 years shows whether the treatment is working. Your doctor will tell you the right schedule for you.

Can a regular X-ray show osteoporosis?

No. A regular X-ray can show a fracture or old spine damage, but it cannot measure bone density accurately enough to diagnose osteoporosis. A DXA scan is the standard test because it measures mineral content precisely.

What if my DXA scan shows osteoporosis but I have never broken a bone?

Many people have osteoporosis without any fractures yet. Your doctor will use your T-score, age, and other risk factors to decide whether you need treatment now or whether monitoring and lifestyle changes are enough. The goal is to prevent a fracture before it happens.