Some spot intruders and kill harmful bacteria.
Others make antibodies to protect your body from bacteria and viruses.
Verywell / Ellen Lindner
Types of WBCs
White blood cells are also known asleukocytes.
They are the body’s defense against infections.
There are several different types with different purposes.
Other white blood cells are part of our humoral or learned immune system.
Humoral immune cells make antibodies after exposure to a germ to help prepare the body for a future attack.
All blood cells come from a commonhematopoieticstem cell (HSC).
These stem cells specializeor differentiatein different stages.
Common symptoms of infections include:
What Is a Normal WBC Count?
A normal white blood cell count is usually between 4,000 and 10,000 cells per microliter (mcL).
Elevated White Blood Cell Counts
Leukocytosis means ahigh white blood cell count.
For example, bacterial infections can cause high white blood cells and can often be treated with antibiotics.
Myeloproliferative Disorders
Myeloproliferativedisorders are a specific group of conditions that can affect blood cells.
Neutropenia makes it more difficult for the body to fight off infections.
As a result, bacteria that are normally not very harmful can cause serious illness.
Cancer patients getting radiation treatment can also have low WBCs.
Summary
White blood cells are an important part of our immune system.
Different types of white blood cells perform different functions in the body.
Overall, white blood cells help to protect us against bacteria, viruses, and parasites.
A high white blood cell countis usually a sign of an infection or illness.
A low white blood cell count can indicate another pop in of problem.
Low white blood cell counts can leave you vulnerable to serious infections.
Chemotherapy is a common cause of low white blood cell counts.
NYC Langone.Types of myeloproliferative disorders.
Leukemia and Lymphoma Society.Myeloproliferative neoplasms.
Leukemia and Lymphoma Society.Myelofibrosis.
National Cancer Institute.Myelodysplastic syndromes.
American Cancer Society.What is chronic myelomonocytic leukemia?.
Gotlib J.How I treat atypical chronic myeloid leukemia.Blood.
2017;129(7):838-845. doi:10.1182/blood-2016-08-693630
Nemours KidsHealth.Juvenile myelomonocytic leukemia (JMML).
MedlinePlus.White blood cell count.
American Cancer Society.Chronic myeloid leukemia early detection, diagnosis, and staging.
Canadian Cancer Society.Myelodysplastic syndromes.
Kasi PM, Grothey A.Chemotherapy-induced neutropenia as a prognostic and predictive marker of outcomes in solid-tumor patients.Drugs.
2018;78(7):737-745. doi:10.1007/s40265-018-0909-3
