![]() ![]() White blood cells make up approximately 1% of the total blood volume in a healthy adult, making them substantially less numerous than the red blood cells at 40% to 45%. In the US, this is usually expressed as 4,000 to 11,000 white blood cells per microliter of blood. The normal white cell count is usually between 4 × 10 9/L and 1.1 × 10 10/L. The number of leukocytes in the blood is often an indicator of disease, and thus the white blood cell count is an important subset of the complete blood count. Less commonly, a high white blood cell count could indicate certain blood cancers or bone marrow disorders. An excess of white blood cells is usually due to infection or inflammation. Produced in the bone marrow, white blood cells defend the body against infections and disease. Historically, white blood cells were classified by their physical characteristics ( granulocytes and agranulocytes), but this classification system is less frequently used now. Lymphoid cells ( lymphocytes) include T cells (subdivided into helper T cells, memory T cells, cytotoxic T cells), B cells (subdivided into plasma cells and memory B cells), and natural killer cells. ![]() Monocytes, macrophages, and neutrophils are phagocytic. Monocytes are further subdivided into dendritic cells and macrophages. Myeloid cells ( myelocytes) include neutrophils, eosinophils, mast cells, basophils, and monocytes. ![]() Types of white blood cells are granulocytes (neutrophils, eosinophils, and basophils), and agranulocytes ( monocytes, and lymphocytes (T cells and B cells)). They help the body fight infection and other diseases. White blood cells are part of the body's immune system. The different white blood cells are usually classified by cell lineage ( myeloid cells or lymphoid cells). All white blood cells have nuclei, which distinguishes them from the other blood cells, the anucleated red blood cells (RBCs) and platelets. Leukocytes are found throughout the body, including the blood and lymphatic system. Īll white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. White blood cells include three main subtypes granulocytes, lymphocytes and monocytes. Occasionally, infections can lead to a life-threatening condition called sepsis.White blood cells, also called leukocytes or leucocytes, are cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. If it's caused by a medicine or other treatment you're having, you may need to stop the treatment or change your dose. Treatment for a low white blood cell count depends on what's causing it. Treatment for a low white blood cell count Signs of an infection may include:Ī blood test can tell you if your white blood cell count is low. The main symptom is getting frequent infections. Check if you have a low white blood cell countĪ low white blood cell count does not always cause any symptoms.
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