What happens during bone densitometry

DEXA uses a low-dose X-ray technique, commonly examining the hip and lower spine. The scanner passes over the body without enclosing you in a tunnel, and no injection is usually needed.

A radiographer confirms your details and relevant medical history, then positions you on a padded table. Supports may be placed beneath the legs or near the feet so the hip or spine is aligned. The scanning arm moves above you while you breathe normally and keep the measured area still.

The machine calculates how much of the X-ray beam passes through bone and soft tissue. A specialist then reviews the images and generates measurements that your requesting clinician interprets with your fracture risks and health history.

Follow the imaging centre's preparation instructions and report any possibility of pregnancy. Tell staff about recent imaging that used contrast material, as it can interfere with the scan. Wear clothing without metal around the area being measured or be prepared to change into a gown.

Most people can resume usual activities immediately afterward. The radiographer may confirm image quality, but the formal result generally comes from the clinician or service responsible for interpreting the examination.

The scan itself does not normally require recovery. Tell staff before positioning if lying flat causes severe pain, you have a recent fracture, or you cannot safely transfer to the table. Seek prompt care for the injury or symptom that led to testing if you cannot walk after a fall, have obvious deformity, or develop severe back pain with new weakness, numbness, or bladder or bowel changes.

Ask which bones will be measured, whether previous scans can be used for comparison, who will explain the report, and what factors besides bone density influence your fracture risk. If the result may affect treatment, clarify the available options and how response would be monitored.