Objectives: To develop reference intervals for leukocyte lysosomal enzymology. Design: Standards-based establishment of reference intervals by analysis of 7851 for 17 assays of 15 lysosomal enzymes in leukocytes and plasma (January 1985 through September 2013). Methods: Reference intervals were calculated using MedCalc for Windows version 12.5 (MedCalc Software, Ostend, Belgium), according to the Clinical and Laboratory Standards Institute C-28A protocol (CSLI-C28A). Results and Conclusion: Evidence-based reference intervals are presented in tabular form for seventeen assays of fifteen lysosomal enzymes.