Bone density tests (also called bone mineral density tests or BMD tests) check how strong your bones are by measuring a small part of one or a few of them. The results can help your doctor know how you can treat or prevent bone loss and fractures.
According to the U.S. Preventive Services Task Force, BMD tests are recommended for:
Two types of machines can measure bone density. Central machines test it in the hip, spine, and total body. Doctors can use them to do different types of bone density tests:
Peripheral machines check the finger, wrist, kneecap, shinbone, and heel. These machines are a good option when DXA scans aren’t available. But DXA scans are still the best choice for screening. Peripheral screening tests include:
Once you get your test results, you and your doctor can decide what to do next.
Many health insurance companies will cover a bone density test. But you need to check ahead of time to see if your plan does and will pay for your testing.
Most health insurers will pay for the test if you have one or more things that raise the chances you have osteoporosis, such as:
Medicare covers bone density testing for specific types of people ages 65 and older:
Medicare will pay for a bone density test every 2 years.
Doctors disagree on this question. The American Medical Association and other major medical groups say that most people don’t need repeat testing to check on their osteoporosis treatment in the first 3 years. Bone density changes so slowly with treatment that the differences may be smaller than the measurement error of the machine. These experts say that repeat scans can’t tell the difference between a real increase in bone density due to treatment and a change in how the machine measures it.
But other groups like the National Osteoporosis Foundation still support repeat testing every 1 to 2 years during treatment. Ask your doctor what is right for you.
Most doctors call for repeating the test in 2 years after you have it the first time. They do it to see if your medication is working.