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www.mayoclinic.org/symptoms/low-white-blood-cell-count/basics/causes/sym-20050615

White blood cells are manufactured in bone marrow — the spongy tissue inside some of your larger bones. A low white blood cell count usually is caused by: Viral infections that temporarily disrupt the work of bone marrow; Certain disorders present at birth (congenital) that involve diminished bone marrow function

www.webmd.com/cancer/white-blood-cell-count-low

Continued Follow-up Tests. If there's no clear reason for a low white blood cell count, your doctor will probably want to do the test again, or do a differential or "diff" along with the CBC.

my.clevelandclinic.org/.../17706-low-white-blood-cell-count/possible-causes

A white blood cell count of less than 400 per cubic millimeter of blood is considered low. Sometimes a low white blood cell count is something you are born with (a genetic condition), which may or may not be a cause for concern. A low white blood cell count is associated with certain conditions, including: Cancer (caused by chemotherapy treatments)

medlineplus.gov/ency/patientinstructions/000675.htm

If the neutrophil count is very low, fewer than 500 neutrophils in a microliter of blood, it is called severe neutropenia. When the neutrophil count gets this low, even the bacteria normally living in a person's mouth, skin, and gut can cause serious infections.

www.findatopdoc.com/Medical-Library/Symptoms/Low-White-Blood-Cell-Count

Low white blood cell count is a condition where the numbers of the white blood cells in your body become too low. White blood cells (also called leukocytes) are part of the immune system, and they are the cells that protect your body against infections by bacteria, viruses, fungi, and parasites.

www.wisegeek.com/what-are-the-different-causes-of-a-low-white-blood-cell-count.htm

White blood cells, also called leukocytes, are the warriors of the immune system. Mostly produced by bone marrow, white blood cell count will initially rise when the body is attacked by a disease. If the infection is overwhelming, however, white blood cells may be consumed faster than they can be released, leading to a low count.

healthyliving.azcentral.com/what-are-the-causes-of-low-platelets-low-white...

A low white blood cell count, leukopenia, means disease-fighting cells have decreased circulating in your blood. Low white blood cell count in adults is generally defined as fewer than 3,500 white blood cells per microliter of blood; in children, it varies with age and gender.

womenshealthency.com/articles/what-causes-a-low-blood-count

A low blood count means that something in your blood is at abnormally low levels, such as red blood cells, white blood cells, hemoglobin or platelets. There are many causes of a low blood count which range the spectrum of medical severity from a simple infection to cancer.

www.healthgrades.com/symptoms/low-white-blood-cell-count

Low White Blood Cell Count Information Including Symptoms, Diagnosis, Treatment, Causes, Videos, Forums, and local community support. Find answers to health issues you can trust from Healthgrades.com

newsnetwork.mayoclinic.org/discussion/low-white-blood-cell-count-not-always-a...

A chronically low white blood cell count (leukopenia) can make you vulnerable to bacterial infections and could signal a serious health problem. Before you start investigating the cause of a low white blood cell count, though, it's important to discuss with your doctor what your test results mean. Different laboratories classify low white blood ...