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Serum values of bioavailable and free 25(OH)D were associated with total 25(OH)D, with r values of 0.942 and 0.943, respectively (P value < 0.001). Parathyroid hormone (PTH) was negatively associated with all vitamin D variables, with correlation coefficients ranging fr
…RESULTS: Serum 25OHD levels were significantly lower in the Diasorin compared to LC-MS/MS assay at baseline, 18.5 7.8 vs 20.5 7.6 ng/ml (p < 0.001), and all other time points. Diasorin (25OHD) = 0.76 LC-MS/MS (25OHD) + 4.3, R(2) = 0.596. The absolute bias was independen
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