DEXA Bone Densitometry
A bone density test checks for osteoporosis, a condition where bones become fragile and more prone to fractures.
The test uses X-rays to measure the grams of calcium and other bone minerals in a segment of bone. Typically, the spine, hip, and sometimes the forearm are the areas examined.
Before the procedure
Medical History
Inform your doctor if you've recently had a barium exam or received contrast material for a CT scan or nuclear medicine test, as these can affect your bone density test results.
Food & Medications
Avoid taking calcium supplements for at least 24 hours before your bone density test.
Clothing & Personal Items
Wear loose, comfortable clothing without zippers, belts, or buttons. Leave jewelry at home and remove any metal objects from your pockets, such as keys, money clips, or change.
What to expect during the procedure
During a DEXA scan patients lie on their backs and the machine passes over them. It is a non-invasive, painless procedure that measures your bone density. The machine uses very low dose x-rays with differing energy levels that get directed at the bones being scanned. The images produced allow the radiologist to determine your bone mineral density. Fewer x-rays pass through denser bone. This information tells doctors the average density of the bone. A low score indicates that the bone is more prone to fracture and some material of the bone has been lost.