G6PD and rheumatic disorder: In another study from Jacobi Medical Center, 36 out of 2,605 (1.4%) patients with rheumatic diseases were found to be deficient in G6PD, and 18 of those patients received hydroxychloroquine without the development of hemolytic anemia (Presentation: Saldarriaga MM, Ramirez de Oleo IE, Johnson B. Presentation 2139: Retrospective Study: Association of Hydroxychloroquine Use and Hemolytic Anemia in Patients with Low Levels of Glucose-6-Phosphate Dehydrogenase (G6PD). American College of Rheumatology and Association of Rheumatology Health Professionals Scientific Meeting; 2011).