Advertisement

How many white blood cells are in a normal adult body?

White blood cells, or leukocytes, are a part of the immune system. They help our bodies fight infection. White blood cells circulate in the blood so they can be transported to an area that has developed an infection. In normal adult bodies there are 4,000 to 10,000 (average 7,000) white blood cells per microliter of blood. If the number of white blood cells in your blood increases, it is a sign of an infection somewhere in the body.

There are six main types of white blood cells:

  • Neutrophils, which make up 58 percent of the blood
  • Eosinophils, which make up 2 percent
  • Basophils, which makes up 1 percent
  • Bands, which makes up 3 percent
  • Monocytes, which makes up 4 percent
  • Lymphocytes, which makes up 4 percent

Most white blood cells are formed in the bone marrow. The neutrophil, eosinophil and basophil type of white blood cells are also called granulocytes. They have granules that contain digestive enzymes. If a granulocyte is released into the blood, it remains for an average of four to eight hours. Then, it goes into the tissues of the body, where it can last for an average of four to five days. If a severe infection is present, these times are often shorter.

Continue Learning about Blood Basics

What is meant by pre-storage leukocyte-reduced red blood cells?
American Red CrossAmerican Red Cross
This form of red blood cells (RBCs) requires special preparation by removing leukocytes (white blood...
More Answers
What is meant by the Rh (rhesus factor)?
American Red CrossAmerican Red Cross
Most people have an inherited antigen on their red blood cells known as Rh, or D antigen. When the D...
More Answers
Do I have to wait to donate blood if I have just had surgery?
American Red CrossAmerican Red Cross
Donors are deferred until their surgical wounds have healed. The underlying condition that precipita...
More Answers
Can I donate blood if I had acupuncture?
American Red CrossAmerican Red Cross
Those who have undergone acupuncture treatments, if otherwise eligible to donate blood, may donate b...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.