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血清中の主たるビタミンD代謝物(Dビタマー)には,1α,25-ジヒドロキシビタミンD3〔1α,25(OH)2D3〕と25-ヒドロキシビタミンD3〔25(OH)D3〕がある.1α,25(OH)2D3はカルシウム代謝の評価に,25(OH)D3はビタミンD栄養の評価に用いられる.血清25(OH)D3濃度の測定は,方法間差,施設間差が大きく標準化が求められている.アメリカ国立標準技術研究所(NIST)の常用参照標準物質(SRM972)を用いた標準化作業を紹介する.
The major circulating form of vitamin D metabolites in serum is 1α,25-dihydroxyvitamin D3 and 25-hydroxyvitamin D3. 1α,25-Dihydroxyvitamin D3 is measured for the evaluation of calcium metabolism, and 25-hydroxyvitamin D3 is measured for the evaluation of vitamin D nutritional status. The assay variation present in measurements of 25-hydroxyvitamin D3 confounds the diagnosis of hypovitaminosis D, and requires standardization from the clinical and nutritional standpoints. Because the National Institute of Standards and Technology (NIST) developed a Standard Reference Material 972 (SRM972), we introduce in this review a standardized procedure for calibration of serum 25-hydroxyvitamin D3 measurements using SRM972.
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