VOA慢速英语 骨质疏松症增加骨折风险

　　VOICE TWO:

　　Another way to measure bone-density is called peripheral bone mineral density testing. It is often used in the United States to show people if they are in danger of osteoporosis. A moveable machine does the test.

　　Medical testing companies sometimes perform this examination at an office or other place of business. The test costs less than the DXA. But peripheral testing measures only one part of the body. Usually that place is the wrist, the heel, or the bones between finger joints.

　　If the testing device is in good condition, it probably will give satisfactory results. But what if the patient has normal bones in the tested areas, but not in others? A person could appear normal on the test. But she still might have osteoporosis in her backbone or hips.

　　VOICE ONE:

　　Differences in bone mineral density among body parts are most often found in women who recently ended their childbearing years. The density may be normal at one place but low at another. Bone mineral density in the spine decreases first. A woman's bone mineral density becomes about the same in all parts of her body after she is seventy years old.

_小精灵 儿童网