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What It Is
Dual-Energy X-Ray Absorptiometry (DEXA) is the most accurate and advanced test available for measuring bone mass. A DEXA test is more sensitive than ordinary x-rays, more accurate than radiograms (radiographic absorptiometry) and can determine even the earliest stages of bone loss associated with osteoporosis.
If your physician has recommended a bone densitometry exam, he or she is most likely wanting to determine your actual bone density and fracture risk. Doing so can reveal early signs of bone loss with the fewest false positive or false negative results, and diagnose low bone mass that may signal the need for treatment.
How It's Performed
DEXA is really a glorified x-ray. You lie back and let the bone densitometer do the work. There is no pain associated with a bone densitometry examination and there are no special preparations required. It is a very safe procedure which involves a small dose of radiation. A DEXA spine scan delivers less than one-tenth the radiation dosage of a chest x-ray.
What to Expect During the Exam
Prior to the exam, you will be asked to provide a brief history, which may include family history of osteoporosis, radiographic findings of osteoporosis, recent fractures, and menopausal status. The exam itself should take no more than about 15 minutes. Measurements of the spine or femur take approximately 2 to 5 minutes, while total body measurements take approximately 10 to 15 minutes.