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Vitamin D: marker, measurand & measurement.
Dirks NF, Cavalier E, Heijboer AC. Dirks NF, et al. Endocr Connect. 2023 Mar 15;12(4):e220269. doi: 10.1530/EC-22-0269. Print 2023 Apr 1. Endocr Connect. 2023. PMID: 36688810 Free PMC article. Review.
The Effect of Vitamin D Supplementation on its Metabolism and the Vitamin D Metabolite Ratio.
Francic V, Ursem SR, Dirks NF, Keppel MH, Theiler-Schwetz V, Trummer C, Pandis M, Borzan V, Grübler MR, Verheyen ND, März W, Tomaschitz A, Pilz S, Heijboer AC, Obermayer-Pietsch B. Francic V, et al. Among authors: dirks nf. Nutrients. 2019 Oct 21;11(10):2539. doi: 10.3390/nu11102539. Nutrients. 2019. PMID: 31640241 Free PMC article. Clinical Trial.
Should we depend on reference intervals from manufacturer package inserts? Comparing TSH and FT4 reference intervals from four manufacturers with results from modern indirect methods and the direct method.
Dirks NF, den Elzen WPJ, Hillebrand JJ, Jansen HI, Boekel ET, Brinkman J, Buijs MM, Demir AY, Dijkstra IM, Endenburg SC, Engbers P, Gootjes J, Janssen MJW, Kniest-de Jong WHA, Kok MB, Kamphuis S, Kruit A, Michielsen E, Wolthuis A, Boelen A, Heijboer AC. Dirks NF, et al. Clin Chem Lab Med. 2024 Jan 12. doi: 10.1515/cclm-2023-1237. Online ahead of print. Clin Chem Lab Med. 2024. PMID: 38205847 Free article.