<unk> erocytes are found in immunologically-mediated hemolytic anemias and in hereditary<unk> , but the former would have a positive direct Coombs test and the latter would not. The misshapen but otherwise healthy red blood cells are mistaken by the spleen for old or damaged red blood cells and it thus constantly breaks them down, causing a cycle whereby the body destroys its own blood supply (auto-hemolysis). A complete blood count (CBC) may show increased reticulocytes, a sign of increased red blood cell production, and decreased hemoglobin and hematocrit. The term "non-hereditary<unk> " is occasionally used, albeit rarely. Lists of causes: * Warm autoimmune hemolytic anemia * Cold autoimmune hemolytic anemia/paroxysmal cold hemoglobinuria * Acute and delayed hemolytic transfusion reactions * ABO hemolytic diseases of newborn/Rh hemolytic disease of newborn * Hereditary<unk>  * Intravenous water infusion or drowning (fresh water) * Hypophosphatemia * Bartonellosis * Snake bites * Hyposplenism * Rh-null phenotype
Spherocytosis
Macrocytosis
Neuroacanthocytosis
Anisocytosis
Pyknocytosis
Anisopoikilocytosis
Poikilocytosis
Plasmacytosis