The main function of white blood cells is to help protect the human body from infection as well as other foreign materials. White blood cells are also known as leukocytes, and they develop in bone marrow from stem cells. More »

Certain white blood cells resemble unicellular organisms, particularly amoebas, in that they are free of set tissue structures, are capable of moving themselves via extension of pseudopods, and they destroy pathogens and... More »

Causes of low blood cell counts in children include leukemia, chemotherapy or radiation treatment, and lack of sufficient vitamin B-12 in the diet, states Children’s Health Network. An infection such as tuberculosis and ... More »

A urinary tract infection is a common cause of white blood cells appearing in the urine, according to MedicineNet. While white blood cells from the opening of the urethra (in both men and women) or the vagina (in women) ... More »

Certain medical conditions, such as cancer or a serious infection, could affect the normal range of white blood cells during a complete blood count, according to Mayo Clinic. Cancer is likely to cause a decrease in white... More »

The presence of white blood cells in urine indicates a medical problem such as an infection in the urinary tract, bladder or kidneys, according to Because urine is a sterile body fluid, there should be n... More »

An elevated white blood cell count occurs when the white blood cells, also referred to as leukocytes, increase in response to infection or illness, according to MedlinePlus. Specific causes of high white blood cell count... More »