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WASHINGTON -- Vitamin D levels are inadequate in up to half of postmenopausal women who receive treatment for osteoporosis, Ethel Siris, M.D., reported during an international symposium sponsored by the National Osteoporosis Foundation.
Vitamin D inadequacy was significantly worse among women who took less than 400 IU of vitamin D supplementation daily, compared with women who took at least 400 IU of vitamin D daily (63% vs. 45%).
Previous study findings suggest that serum 25-hydroxyvitamin D concentrations of at least 30 ng/mL are needed to stabilize serum parathyroid hormone levels, Dr. Siris, director of the metabolic bone diseases program at Columbia University, New York, and her colleagues, wrote in a poster presentation.
In a cross-sectional, observational study conducted between November 2003 and March 2004, the investigators collected blood samples from 1,536 postmenopausal women, mean age 71 years, at 61 sites ...