The assessment of circulating 25(OH)D and 1,25(OH)2D: Where we are and where we are going

COMPETITIVE PROTEIN-BINDING RADIOASSAY FOR 25-HYDROXYCHOLECALCIFEROL¹

John G. Haddad, Kyung Ja Chyu · The Journal of Clinical Endocrinology & Metabolism · 1971 · 907 citations

Pharmacy, Pharmacokinetics, Pharmacology +6

A Microassay for 1,25-Dihydroxyvitamin D Not requiring High Performance Liquid Chromatography: Application to Clinical Studies*

Timothy A. Reinhardt, Ronald L. Horst, John W. Orf et al. · The Journal of Clinical Endocrinology & Metabolism · 1984 · 805 citations

Pharmacy, Pharmacology, Biopharmaceutics +15

Genetic evidence that the human CYP2R1 enzyme is a key vitamin D 25-hydroxylase

Jeffrey B. Cheng, Michael A. Levine, Norman H. Bell et al. · Proceedings of the National Academy of Sciences · 2004 · 746 citations · Full text

Life Sciences, Biochemistry, Genetics +17

Assay Variation Confounds the Diagnosis of Hypovitaminosis D: A Call for Standardization

Neil Binkley, Diane Krueger, C. S. Cowgill et al. · The Journal of Clinical Endocrinology & Metabolism · 2004 · 580 citations · Full text

Medicine, Endocrinology, Nutritional Sciences +14

A sensitive, precise, and convenient method for determination of 1,25-dihydroxyvitamin D in human plasma

John A. Eisman, Alan J. Hamstra, Barbara E. Kream et al. · Archives of Biochemistry and Biophysics · 1976 · 512 citations

Life Sciences, Biochemistry, Nutritional Sciences +12