A fourth year medical laboratory student wanted to measure the hemoglobin level of under five children in the community for research purpose using a hemoCue method. The student made skin puncture and a small drop of capillary blood was attracted by capillary action into a specially designed single used microcuvette which contains dry reagents (sodium azide, and sodium nitrite). What is the most likely role of sodium nitrite and sodium azide in this procedure? a. To disintegrate the red cell membrane b. To disintegrate the white blood cells c. To convert hemoglobin to methemoglobin d. To decrease the turbidity in the solution