What is a white blood count (WBC)?A white blood count measures the number of white cells in your blood. White blood cells are part of the immune system. They help your body fight off infections and other diseases. Show
When you get sick, your body makes more white blood cells to fight the bacteria, viruses, or other foreign substances causing your illness. This increases your white blood count. Other diseases can cause your body to make fewer white blood cells than you need. This lowers your white blood count. Diseases that can lower your white blood count include some types of cancer and HIV/AIDS, a viral disease that attacks white blood cells. Certain medicines, including chemotherapy, may also lower the number of your white blood cells. There are five major types of white blood cells:
A white blood count measures the total number of these cells in your blood. Another test, called a blood differential, measures the amount of each type of white blood cell. Other names: WBC count, white cell count, white blood cell count What is it used for?A white blood count is most often used to help diagnose disorders related to having a high white blood cell count or low white blood cell count. Disorders related to having a high white blood count include:
Disorders related to having a low white blood count include:
A white blood count can show if the number of your white blood cells is too high or too low, but it can't confirm a diagnosis. So it is usually done along with other tests, such as a complete blood count, blood differential, blood smear, and/or bone marrow test. Why do I need a white blood count?You may need this test if you have signs of an infection, inflammation, or autoimmune disease. Symptoms of infection include:
Symptoms of inflammation and autoimmune diseases will be different, depending on the area of inflammation and type of disease. You may also need this test if you have a disease that weakens your immune system or are taking medicine that lowers your immune response. If the test shows your white blood count is getting too low, your provider may be able to adjust your treatment. Your newborn or older child may also be tested as part of a routine screening, or if they have symptoms of a white blood cell disorder. What happens during a white blood count?A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. To test children, a health care provider will take a sample from the heel (newborns and young babies) or the fingertip (older babies and children). The provider will clean the heel or fingertip with alcohol and poke the site with a small needle. The provider will collect a few drops of blood and put a bandage on the site. Will I need to do anything to prepare for the test?You don't need any special preparations for a white blood count. Are there any risks to the test?After a blood test, you may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. There is very little risk to your baby or child with a needle stick test. Your child may feel a little pinch when the site is poked, and a small bruise may form at the site. This should go away quickly. What do the results mean?A high white blood count may mean you have one of the following conditions:
A low white blood count may mean you have one of the following conditions:
If you are already being treated for a white blood cell disorder, your results may show if your treatment is working or whether your condition has improved. If you have questions about your results, talk to your health care provider. Learn more about laboratory tests, reference ranges, and understanding results. Is there anything else I need to know about a white blood count?White blood count results are often compared with results of other blood tests, including a blood differential. A blood differential test shows the amount of each type of white blood cell, such as neutrophils or lymphocytes. Neutrophils mostly target bacterial infections. Lymphocytes mostly target viral infections.
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Is it normal to have a slightly elevated white blood cell count?Leukocytosis is a normal immune response and isn't always a cause for concern. Most of the time, it means that your body is fighting off infection or inflammation. However, there are times when a high white blood cell count could indicate something more serious, such as leukemia.
When should I be worried about high WBC?Get prompt medical attention if you develop any of the following: High fever above 103 degrees. Sudden or rapidly worsening joint or skin redness, swelling, or pain. Recurrent nausea, vomiting, or diarrhea.
What diseases does a high white blood cell count indicate?A high white blood count may mean you have one of the following conditions:. A bacterial or viral infection.. An inflammatory disease such as rheumatoid arthritis.. An allergy.. Leukemia or Hodgkin disease.. Tissue damage from a burn injury or surgery.. What is an alarming white blood cell count?How many white blood cells (WBCs) someone has varies, but the normal range is usually between 4,000 and 11,000 per microliter of blood. A blood test that shows a WBC count of less than 4,000 per microliter (some labs say less than 4,500) could mean your body may not be able to fight infection the way it should.
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What does a slightly elevated white blood cell count mean
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