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Vitamin D metabolites in synovial fluid.
  1. A Fairney,
  2. A M Straffen,
  3. C May,
  4. M H Seifert

    Abstract

    This study has shown that it is possible to measure vitamin D metabolites and vitamin D binding protein (DBP) in synovial fluid as well as serum. Significant amounts of 25-OHD, 24,25-(OH)2D, and DBP are present in synovial fluid. The 25-OHD and DBP maintain a serum:synovial fluid ratio of approximately 2:1 irrespective of the type of joint disease, whereas no such relationship was detected for 24,25-(OH)2D. The possible reasons for these findings are diffusion of the metabolites into synovial fluid or local production from suitable precursors, or both.

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