Abnormal erythrocyte enzyme concentration or activity +
Abnormal erythrocyte metabolite concentration +
Abnormal hematocrit +
Abnormal hemoglobin +
Abnormal hemoglobin concentration +
Abnormal mean corpuscular hemoglobin concentration +
Abnormal mean corpuscular volume +
Abnormal number of erythroid precursors +
Abnormal red blood cell count +
Abnormal reticulocyte morphology +
Anemia +
Anisocytosis
Blood group antigen abnormality +
Circulating nucleated red blood cells
Dysplastic erythropoesis
Erythrocyte inclusion bodies +
Increased Burr cell count
Increased RBC distribution width
Red blood cell distribution width (RDW) is a simple parameter of the standard full blood count and a measure of heterogeneity in the size of circulating erythrocytes. It is provided by automated hematology analyzers and it reflects the range of the red cell size. It is calculated by dividing the standard deviation of erythrocyte volume by the mean corpuscular volume (MCV) and multiplied by 100 to convert to a percentage.