Bone Densitometry (DEXA)

Bone densitometry, also called dual-energy x-ray absorptiometry or DEXA, uses a low dose of ionizing radiation to measure the density of your bones. The most common areas tested during a bone density scan often include the hip, spine, and forearm or wrist.

Common Uses of DEXA

DEXA is most often used to diagnose osteoporosis, a gradual thinning and weakening of the bones due to loss of calcium and structural changes that occur with age. Bone density tests can identify the severity of bone loss, determine the risk of fractures, and monitor the effectiveness of osteoporosis treatment.

Who should have a bone density test?

If you have been diagnosed with osteoporosis or are at risk for osteoporosis, you should consider having a bone density test. Although the condition is more common in postmenopausal women, men and younger women can develop it as well. The National Osteoporosis Foundation (NOF) strongly recommends a bone density test if:

You are a postmenopausal woman (age 65 or older) and not taking estrogen
You are a man age 70 or older
You break a bone after age 50
You are a man or woman with known risk factors

Bone density tests may also be recommended by your doctor if:

You have fractured your bones bones or have a family history of bone fractures
You have had a height loss of ½ inch or more within one year
You have had a total height loss of 1 ½ inches from your original height
You are deficient in Vitamin D
You use or have used medications that are known to cause bone loss, including corticosteroids such as Prednisone and seizure medications such as Dilantin