abnormal cellular hemoglobin content decreased cellular hemoglobin content CH is reported in picograms (pg). MP:0008956 MPheno.ontology decrease in the mean of the red blood cell hemoglobin concentration (RBC CH) histogram, which represents the distribution of red blood cells by the amount of hemoglobin present in each individual cell independent of cell volume decreased CH decreased corpuscular hemoglobin content reduced CH reduced corpuscular hemoglobin content