Today, the possibility exists to measure a number of different vitamin D metabolites with accurate and precise methods. The most abundant vitamin D metabolite, 25(OH)D, is considered the best marker for estimating vitamin D status and is therefore the most commonly measured in clinical practice. There is no consensus on the added value of measuring other metabolites beyond 25-hydroxyvitamin D, although, in some special clinical scenarios and complicated cases, these metabolites may provide just the information needed for an accurate diagnosis. The problem this review addresses is which metabolite to measure and when and how to measure it.

中文翻译：

---

维生素D代谢物的测量第二部分-各种维生素D代谢物的测量。

如今，有可能使用精确的方法测量多种不同的维生素D代谢产物。最丰富的维生素D代谢物25（OH）D被认为是估计维生素D状况的最佳标记，因此在临床实践中最常测量。尽管在某些特殊的临床情况和复杂的情况下，这些代谢物可能仅提供准确诊断所需的信息，但对于测量25-羟基维生素D以外的其他代谢物的附加价值尚无共识。这篇综述解决的问题是要测量哪种代谢物以及何时以及如何测量它。