G6PD and paroxysmal nocturnal hemoglobinuria: However, tests to estimate glucose-6-phosphate dehydrogenase (G6PD) levels, paroxysmal nocturnal hemoglobinuria (PNH) by flow cytometry (FCM), rapid malaria test (RMT), dengue serology, and serological testing for hepatitis B surface antigen (HBsAg), anti-hepatitis C virus (HCV) antibody, and human immunodeficiency virus (HIV) returned negative or normal.