Chronic granulomatous disease (CGD) and complete myeloperoxidase deficiency both yield strongly reduced dihydrorhodamine 123 test signals but can be easily discerned in routine testing for CGD - Mauch, L; Lun, A; O’Gorman, MR; Harris, JS; Schulze, I; Zychlinsky, A; Fuchs, T; Oelschlagel, U; Brenner, S; Kutter, D; Rosen-Wolff, A; Roesler, J (Clin Chem, 2007)