abnormal mean corpuscular hemoglobin decreased mean corpuscular hemoglobin MP:0005562 MPheno.ontology Mean corpuscular hemoglobin (MCH) is a standard measurement in clinical chemistry, usually reported in picograms/cell. decreased MCH hypochromasia hypochromatism hypochromia hypochromic erythrocyte hypochromic red cell hypochrosis less than the average levels of hemoglobin contained in an erythrocyte low MCH low mean corpuscular hemoglobin reduced mean corpuscular hemoglobin