Reticulocyte Corpuscular Hemoglobin Distribution Width (Experimental Factor Ontology identifier EFO_0009230) is a measurement of the standard deviation of hemoglobin concentrations in reticulocytes, calculated as the standard deviation of hemoglobin content divided by the mean hemoglobin content. [ NCI ]. Also known as: CHDWR, Ret Corpuscular HGB Conc Distr Width.