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Study: Many women can skip frequent bone scans
ATLANTA (AP) - New research could mean millions of older women can skip frequent screening tests for osteoporosis: If an initial bone scan shows no big problems, many can safely wait 15 years to have another one, the study suggests.
Government advisers and leading doctor groups urge osteoporosis screening, but no one has known how often that should happen. The findings offer the best information to date on that question, experts said.
“This is landmark, in the sense that it could allow us to move on to more precise guidelines,” said Dr. Heidi Nelson, a researcher at the Oregon Health & Science University who is an expert on the topic.
At issues are bone mineral density tests, which usually are done through X-rays and cost around $250. It takes about 10 minutes and involves less radiation than what’s emitted during a chest X-ray. Medicare pays for testing every two years.
The new study feeds concerns that the tests are done too often, at least for some women.
“It’s an expenditure of time, it’s exposure to radiation, and it’s cost. And there’s no reason to expose yourself to any risks if there’s going to be no benefit,” explained Dr. Virginia Moyer, who heads the U.S. Preventive Services Task Force, a government panel that issues testing guidelines.
The test measures how thick bones are in certain spots, usually focusing on the hip and lower spine. Doctors use it to gain early warning of osteoporosis, a bone-thinning disease that can be staved off with better diet and exercise and treated with bone-building drugs. Nearly half of all women older than 50 will break a bone because of osteoporosis, according to the National Osteoporosis Foundation.
The government task force recommends that all women over 65 get a scan. The panel also recommends testing for younger postmenopausal women who seem at higher risk for fractures. But the task force has not said how often follow-up tests should be done, just that a couple years between tests are needed.
The new, government-funded research involves nearly 5,000 women aged 67 years and older in a national health study that began in the 1980s. None had osteoporosis at the outset.
The researchers looked at how the women did on bone density tests, and watched for who got osteoporosis and when. They were followed for 15 years.
Based on that, the researchers concluded that women with a healthy initial test could wait as long as 15 years before getting a second screening. But women deemed at moderate risk should get tested about every five years. And women at high risk should get tested more often, perhaps even annually.
The research, published in Thursday’s New England Journal of Medicine, was led by Dr. Margaret Gourlay of the University of North Carolina. She worries that her findings might be misinterpreted and cause some women to wait longer than they should for their next test. She cited earlier research suggesting not enough women get the recommended initial scan.
The 15-year interval applies only to postmenopausal women judged to be at low risk for osteoporosis from the first screening, she noted, and perhaps fewer than half of U.S. women over 65 fall into that category.
But she said even for those women, other risk factors have to be considered: smoking, slim build, prior broken bones and taking medication that has an eroding effect on bones.
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