1. International Standard Medical laboratories – requirements for quality and competence, ISO 15189-2012(E). ISO Copyright Office: Geneva, Switzerland; 2012:1–39 pp.
2. Haeckel, R, Wosniok, W, Streichert, T. Review of potentials and limitations of indirect approaches for estimating reference limits of quantitative procedures in laboratory medicine. J Lab Med 2021;45:35–53. https://doi.org/10.1515/labmed-2020-0131.
3. Sikaris, K. Physiology and its importance for reference intervals. Clin Biochem Rev 2014;35:3–14.
4. Jones, GRD, Haeckel, R, Loh, TP, Sikaris, K, Streichert, T, Katayev, A, et al.. Indirect methods for reference interval determination – review and recommendations. Clin Chem Lab Med 2019;57:20–9.
5. Farrell, CJL, Nguyen, L. Indirect reference intervals: harnessing the power of stored laboratory data. Clin Biochem Rev 2019;40:99–111.