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Simultaneous spectrophotometric calibration of wavelength and absorbance in an interlaboratory survey using holmium oxide (Ho2O3) in perchloric acid as reference, compared with p-nitrophenol and cobaltous sulphate solutions (1978-1984).
Jansen AP, van Kampen EJ, Steigstra H, van der Ploeg PH, Zwart A. Jansen AP, et al. Among authors: steigstra h. J Clin Chem Clin Biochem. 1986 Feb;24(2):141-6. doi: 10.1515/cclm.1986.24.2.141. J Clin Chem Clin Biochem. 1986. PMID: 3011950
Harmonisation of seven common enzyme results through EQA.
Weykamp C, Franck P, Gunnewiek JK, de Jonge R, Kuypers A, van Loon D, Steigstra H, Cobbaert C; General Chemistry Division of the SKML (Foundation for Quality Assessment in Medical Laboratories, The Netherlands). Weykamp C, et al. Among authors: steigstra h. Clin Chem Lab Med. 2014 Nov;52(11):1549-55. doi: 10.1515/cclm-2014-0458. Clin Chem Lab Med. 2014. PMID: 24887962
Creatinine, Jaffe, and glucose: another inconvenient truth.
Weykamp C, Kuypers A, Bakkeren D, Franck P, Loon Dv, Gunnewiek JK, Jonge Rd, Steigstra H, Cobbaert C. Weykamp C, et al. Among authors: steigstra h. Clin Chem Lab Med. 2015 Nov;53(12):e347-9. doi: 10.1515/cclm-2015-0258. Clin Chem Lab Med. 2015. PMID: 25996486 No abstract available.