Blood counts are an important way of measuring your child’s health. During treatment your child's care team will do many blood tests. Chemotherapy can affect blood counts. This section explains blood counts and suggests what to do and what to void when blood counts are affected.

Blood cells are made in the bone marrow. Bone marrow is the soft tissue found in the middle of the long bones (thigh, upper arm) and flat bones (pelvis) of the body. Once cells are made in the bone marrow the cells move into the bloodstream to help bring nutrients to body tissues and to protect the body against infection or bleeding.

A complete blood count, or CBC, is a count of the different types and subtypes of cells in the blood, including red blood cells (RBCs), platelets, and white blood cells (WBCs).

Several things can make the bone marrow produce fewer cells: a serious infection, certain types of cancer, and certain medicines, including chemotherapy.

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