title: 25-Hydroxyvitamin D and 1,25-dihydroxyvitamin D determined in serum by "SPE-Octadecyl (C18)" column extraction and radioassay.
authors.affiliation: Dept. of Clin. Chem., University Hosp., Leiden, The Netherlands.
authors.forename: P F
authors.initials: PF
authors.lastname: Franck
authors.forename: G A
authors.initials: GA
authors.lastname: de Maaker
authors.forename: A J
authors.initials: AJ
authors.lastname: Moolenaar
mesh_terms: D004100:Dihydroxycholecalciferols / Q000097:blood*; D006706:Homeostasis; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D011863:Radioimmunoassay; D011869:Radioligand Assay; D012822:Silicon Dioxide
chemical_list: D004100:Dihydroxycholecalciferols; D006887:Hydroxycholecalciferols; D012822:Silicon Dioxide; C042953:octadecyl silane-bonded silica