For example, a hematocrit of 38 means that 38% of the blood's volume is made of red blood cells. The value is given as a percentage of red blood cells in a volume of blood. This test measures the amount of space (volume) red blood cells take up in the blood. Hematocrit (HCT, packed cell volume, PCV). This also makes it hard for your red blood cells to carry oxygen. If the count is too high (a condition called polycythemia), there's a chance that the red blood cells will clump together and block tiny blood vessels (capillaries). If the RBC count is low (anemia), the body may not be getting the oxygen it needs. They also carry carbon dioxide back to the lungs so it can be exhaled. Red blood cells carry oxygen from the lungs to the rest of the body. Too many or too few of the different types of white blood cells can help find an infection, an allergic or toxic reaction to medicines or chemicals, and many conditions, such as leukemia. The numbers of each one of these types of white blood cells give important information about the immune system. Each type of cell plays a different role in protecting the body. Immature neutrophils, called band neutrophils, are also part of this test. The major types of white blood cells are neutrophils, lymphocytes, monocytes, eosinophils, and basophils. White blood cell types (WBC differential). The number of white blood cells is sometimes used to find an infection or to see how the body is dealing with cancer treatment.
When a person has a bacterial infection, the number of white cells rises very quickly. White blood cells are bigger than red blood cells but fewer in number.
If an infection develops, white blood cells attack and destroy the bacteria, virus, or other organism causing it. White blood cells protect the body against infection. A CBC also helps him or her diagnose conditions, such as anemia, infection, and many other disorders.Ī CBC test usually includes: White blood cell (WBC, leukocyte) count. A CBC helps your doctor check any symptoms that you may have, such as weakness, fatigue, or bruising. A complete blood count (CBC) gives important information about the kinds and numbers of cells in the blood, especially red blood cells, white blood cells, and platelets.
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