Anemia (AmE) or anæmia/anaemia (BrE), from the Greek (Ἀναιμία) (an-haîma) meaning "without blood", is a deficiency of red blood cells (RBCs) and/or hemoglobin. This results in a reduced ability of blood to transfer oxygen to the tissues,...

Polycythemia (or polycythaemia) is a condition in which there is a net increase in the total number of red blood cells in the body. The overproduction of red blood cells may be due to a primary process in the bone marrow (a so-called myeloproliferative...

Acquired pure red cell aplasia

Transient erythroblastopenia of childhood

Erythroblastopenia (a decrease of red blood cells in a complete blood count) can refer to: