The Erythrocyte glutathione reductase (EGR) activation test is a specific biochemical assay used to evaluate the nutritional status of a particular vitamin.
This test measures the activity of the enzyme glutathione reductase found in red blood cells (erythrocytes). The activity of this enzyme is dependent on its coenzyme form, Flavin Adenine Dinucleotide (FAD).
Therefore, the Erythrocyte glutathione reductase (EGR) activation test is the accepted method for assessing the nutritional status of Riboflavin.
| List-I (Terms) | List-II (Explanations) |
| A. Biohazards | I. Single celled living organism |
| B. Bacteria | II. Most lethal ultra microscopic inert infectious agents |
| C. Viruses | III. Organisms which live in or on another living organisms |
| D. Parasites | IV. Hazards related to disease in plants, animals and humans |