A Comparison of Serum and Urine N-telopeptide Marker

"This is a prospective specimen collection cohort study to evaluate the correlation between serum and urine values of the bone marker of interest (N-Telopeptide), and their association with baseline DEXA scan measures and fracture risk within 6 months.~Study samples will be obtained longitudinally. One collection of both serum and urine collection will be obtained. The urine will be collected as second void of day and at the same time the blood collection is drawn."