Protocol for measuring erythrocyte glutathione reductase activity coefficient to assess riboflavin status ScienceDirect Red blood cells based nanotheranostics: A smart biomimetic approach for fighting against cancer ScienceDirect Frontiers Serum glutathione peroxidase 3 concentration at diagnosis as a biomarker for assessing disease activity and damage of antineutrophil cytoplasmic antibody associated vasculitis at diagnosis If you miss these five steps before a blood test, the results will not give an accurate picture of health., 1. Hydration must be managed the evening prior as well as the morning, not just an hour