Blood Products, Blood Counts "Do you know ..." is an educational series for patients and their families. Blood counts - Do You Know Educational Series Blood is made up of cells in a liquid called plasma. Blood cells are made in the bone marrow (the soft center of the bones). In patients with cancer, counting and studying blood cells can tell the staff about a patient's disease and how to treat it. Calculating the ANC - Do You Know Educational Series ANC - The Absolute Neutrophil Count gives your child's medical team an estimate of the body's ability to fight infections, especially bacterial infections. Receiving a blood transfusion - Do You Know Educational Series A blood transfusion may be needed if your child's blood or specific blood parts are at dangerously low levels. A transfusion can replace what is missing. Symptoms of a blood product transfusion reaction - Do You Know Educational Series If your child receives blood or blood products, watch for these symptoms of a possible transfusion reaction.