Blood is the fluid in the circulatory system that carries oxygen, food, and waste products. The blood fluid consists of plasma, red blood cells, white blood cells, and platelets. Red blood cell disorders include anemia (too few) and polycythemia (too many). White blood cells are part of the immune system, with disorders including low white cells, raised white blood cells, and many others. Platelets are related to blood clotting and disorders may involve poor clotting or excessive clot formation (e.g. clotting disorders; embolism; DVT). Read more about: Blood disorders, Red blood cell disorders, White blood cell disorders

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