A DEXA (dual-energy x-ray absorptiometry) scan is a medical test that is used to measure bone density.
It is a painless and non-invasive test that is usually done on the spine and hip, but can also be performed on other bones in the body. DEXA scans are commonly used to diagnose and monitor osteoporosis, a condition in which bones become weak and fragile and are more likely to break.
During a DEXA scan, the patient lies on a table while a machine scans the body using two low-dose X-ray beams. One beam is high in energy, while the other is low. The difference between the two beams is used to measure the bone density. The test takes approximately 10-30 minutes to complete, depending on which bones are being scanned.
DEXA scans are safe and painless, with no preparation required.
However, patients may be asked to avoid taking calcium supplements for 24 hours before the test, as they can interfere with the results.
A DEXA scan is an important tool for assessing bone health, particularly in postmenopausal women and men over 70 years old. It can also be used to assess the risk of fractures in people who have already had a fracture, or who have other risk factors for osteoporosis.
The results of a DEXA scan are reported as a T-score, which compares the patient’s bone density to that of a healthy young adult of the same gender.
A T-score of -1.0 or higher is considered normal, while a T-score between -1.0 and -2.5 indicates low bone density (osteopenia), and a T-score of -2.5 or lower indicates osteoporosis.
In addition to the T-score, the report may also include a Z-score, which compares the patient’s bone density to that of other people of the same age and gender.
If a patient is diagnosed with osteoporosis or osteopenia, their doctor may recommend lifestyle changes such as exercise and a healthy diet, as well as medications to help prevent further bone loss and reduce the risk of fractures.
In conclusion, a DEXA scan is a quick, painless, and important tool for assessing bone health and diagnosing osteoporosis. If you are at risk of osteoporosis, talk to your doctor about whether it is right for you.
What happens during a DEXA scan?
During a DEXA scan, the patient lies on a table while a machine scans the body using two low-dose X-ray beams. One beam is high in energy, while the other is low. The difference between the two beams is used to measure the bone density.
How long does a DEXA scan take?
It usually takes approximately 10-30 minutes to complete, depending on which bones are being scanned.
Do I need to prepare for a DEXA scan?
No, there is no preparation required for a DEXA scan. However, patients may be asked to avoid taking calcium supplements for 24 hours before the test.
