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How is Osteoporosis Diagnosed ?


How is Osteoporosis Diagnosed ?

The diagnosis of osteoporosis is made on measuring the bone mineral density (BMD). The most popular method is dual energy X-ray absorptiometry (DXA or DEXA). In addition to the detection of abnormal BMD, the diagnosis of osteoporosis requires investigations into potentially modifiable underlying causes; this may be done with blood tests and X-rays. Depending on the likelihood of an underlying problem, investigations for cancer with metastasis to the bone, multiple myeloma, Cushing's disease and other above mentioned causes may be performed.

A routine x-ray can reveal osteoporosis of the bone, which appears much thinner and lighter than normal bones. Unfortunately, by the time x-rays can detect osteoporosis, at least 30% of the bone has already been lost. In addition, x-rays are not accurate indicators of bone density. The appearance of the bone on x-ray is often affected by variations in the degree of exposure of the x-ray film.

The National Osteoporosis Foundation, the American Medical Association, and other major medical organizations are recommending a dual energy x-ray absorptiometry scan (DXA, formerly known as DEXA) for diagnosing osteoporosis. DXA measures bone density in the hip and the spine. The test takes only 5 to 15 minutes to perform, uses very little radiation (less than one tenth to one hundredth the amount used on a standard chest x-ray), and is quite precise.

The bone density of the patient is then compared to the average peak bone density of young adults of same sex and race. This score is called the "T score," and it expresses the bone density in terms of the number of standard deviations (SD) below peak young adult bone mass.
  • Osteoporosis is defined as bone density T score of –2.5 SD or below.
  • Osteopenia (between normal and osteoporosis) is defined as bone density T score between –1 and –2.5 SD.



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