EFO_0009204 (Corpuscular Hemoglobin Concentration Distribution Width) is a measurement of the standard deviation of hemoglobin concentrations in individual red blood cells, calculated as the standard deviation of hemoglobin content divided by the mean hemoglobin content. [ NCI ]. Also known as: CHDW, Corpuscular HGB Conc Distribution Width, Erythrocyte Corpuscular Hemoglobin Concentration Distribution Width.