Coronavirus White

White Blood Count (WBC)

White Blood Count (WBC) thumbnail

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. When you get sick, your body makes more white blood cells to fight the bacteria, viruses,…

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.

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:

  • Neutrophils
  • Lymphocytes
  • Monocytes
  • Eosinophils
  • Basophils

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:

  • Diseases of the immune system, such as HIV/AIDS
  • Lymphoma, a cancer of the bone marrow
  • Diseases of the liver or spleen

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 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

A low white blood count may mean you have one of the following conditions:

  • Bone marrow damage. This may be caused by infection, disease, or treatments such as chemotherapy.
  • Cancers that affect the bone marrow
  • An autoimmune disorder, such as lupus (or SLE)
  • HIV/AIDS

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.

  • A higher than normal amount of neutrophils is known as neutrophilia.
  • A lower than normal amount is known as neutropenia.
  • A higher than normal amount of lymphocytes is known as lymphocytosis.
  • A lower normal amount is known as lymphopenia.

References

  1. Cleveland Clinic [Internet]. Cleveland (OH): Cleveland Clinic; c2020. High White Blood Cell Count: Overview; [cited 2020 Jun 14]; [about 3 screens]. Available from: https://my.clevelandclinic.org/health/diagnostics/17704-high-white-blood-cell-count
  2. Cleveland Clinic [Internet]. Cleveland (OH): Cleveland Clinic; c2020. Low White Blood Cell Count: Overview [cited 2020 Jun 14]; [about 3 screens]. Available from: https://my.clevelandclinic.org/health/symptoms/17706-low-white-blood-cell-count
  3. Cleveland Clinic [Internet]. Cleveland (OH): Cleveland Clinic; c2020. Low White Blood Cell Count: Possible Causes; [cited 2020 Jun 14]; [about 4 screens]. Available from: https://my.clevelandclinic.org/health/symptoms/17706-low-white-blood-cell-count/possible-causes
  4. Henry Ford Health System [Internet]. Henry Ford Health System; c2020. Pathology: Blood Collection: Babies and Children; [updated 2020 May 28; cited 2020 Jun 14]; [about 3 screens]. Available from: https://lug.hfhs.org/babiesKids.html
  5. Lab Tests Online [Internet]. Washington D.C.: American Association for Clinical Chemistry; c2001–2020. HIV Infection and AIDS; [updated 2019 Nov 25; cited 2020 Jun 14]; [about 2 screens]. Available from: https://labtestsonline.org/conditions/hiv-infection-and-aids
  6. Lab Tests Online [Internet]. Washington D.C.: American Association for Clinical Chemistry; c2001–2020. White Blood Cell Count (WBC); [updated 2020 Mar 23; cited 2020 Jun 14]; [about 2 screens]. Available from: https://labtestsonline.org/tests/white-blood-cell-count-wbc
  7. Mayo Clinic [Internet]. Mayo Foundation for Medical Education and Research; c1998–2020. High white blood cell count: Causes; 2018 Nov 30 [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.mayoclinic.org/symptoms/high-white-blood-cell-count/basics/causes/sym-20050611
  8. Mayo Clinic [Internet]. Mayo Foundation for Medical Education and Research; c1998–2020. Low white blood cell count: Causes; 2018 Nov 30 [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.mayoclinic.org/symptoms/low-white-blood-cell-count/basics/causes/sym-20050615
  9. Mayo Clinic [Internet]. Mayo Foundation for Medical Education and Research; c1998–2020. Lymphocytosis: Definition; 2019 Jul 12 [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.mayoclinic.org/symptoms/lymphocytosis/basics/definition/sym-20050660
  10. Mayo Clinic [Internet]. Mayo Foundation for Medical Education and Research; c1998–2020. Pediatric white blood cell disorders: Symptoms and causes; 2020 Apr 29 [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.mayoclinic.org/diseases-conditions/pediatric-white-blood-cell-disorders/symptoms-causes/syc-20352674
  11. Merck Manual Consumer Version [Internet]. Kenilworth (NJ): Merck & Co. Inc.; c2020. Overview of White Blood Cell Disorders; [updated 2020 Jan; cited 2020 Jun 14]; [about 2 screens]. Available from: https://www.merckmanuals.com/home/blood-disorders/white-blood-cell-disorders/overview-of-white-blood-cell-disorders
  12. National Cancer Institute [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; NCI Dictionary of Cancer Terms: lymphopenia; [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.cancer.gov/publications/dictionaries/cancer-terms/def/lymphopenia
  13. National Heart, Lung, and Blood Institute [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; Blood Tests; [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.nhlbi.nih.gov/health-topics/blood-tests
  14. Nicklaus Children’s Hospital [Internet]. Miami (FL): Nicklaus Children’s Hospital; c2020. WBC count; [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.nicklauschildrens.org/tests/wbc-count
  15. University of Rochester Medical Center [Internet]. Rochester (NY): University of Rochester Medical Center; c2020. Health Encyclopedia: White Cell Count; [cited 2020 Jun 14]; [about 2 screens]. Available from: https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=white_cell_count
  16. UF Health: University of Florida Health [Internet]. Gainesville (FL): University of Florida Health; c2020. WBC count: Overview; [updated 2020 Jun 14; cited 2020 Jun 14]; [about 2 screens]. Available from: https://ufhealth.org/wbc-count
  17. Very Well Health [Internet]. New York: About, Inc.; c2020. An Overview of White Blood Cell Disorders; [cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.verywellhealth.com/white-blood-cell-disorders-overview-4013280
  18. Very Well Health [Internet]. New York: About, Inc.; c2020. Neutrophils Function and Abnormal Results; [updated 2019 Sep 30; cited 2020 Jun 14]; [about 3 screens]. Available from: https://www.verywellhealth.com/what-are-neutrophils-p2-2249134#causes-of-neutrophilia

Leave a Comment

You must be logged in to post a comment.

X

Coronavirus disease (COVID-19) outbreak

Coronavirus disease 2019 (COVID-19) is a respiratory illness that can spread from person to person. The virus that causes COVID-19 is a novel coronavirus.