Loré F, Di Cairano G, Battistelli S
Boll Soc Ital Biol Sper. 1981 Jun 15;57(11):1167-9.
A retrospective study of the serum concentrations of 25-hydroxyvitamin D was performed over a one-year period, using data from 158 healthy subjects aged 40-80 years. Serum 25-hydroxyvitamin D was determined by competitive protein binding assay; the method included a chromatographic step. A noticeable seasonal variation was observed, with a maximum in summer.
一项为期一年的回顾性研究对158名年龄在40至80岁之间的健康受试者的数据进行了分析，以测定血清25-羟维生素D的浓度。血清25-羟维生素D通过竞争性蛋白结合分析法测定；该方法包括一个色谱步骤。研究观察到了明显的季节性变化，夏季浓度最高。
