Common causes of a high white blood cell count include infection, drug reaction, immune system disorder and bone marrow disease, according to Mayo Clinic. Severe allergic reactions, smoking, and high levels of physical o... More » Health Medical Ranges & Levels

High blood cell counts can be a result of a condition that increases the bone marrow's production of white or red blood cells, according to Mayo Clinic. White blood cell production increases when the body needs to fight ... More »

A high white blood cell count typically indicates a bacterial or viral infection; a disorder of the immune system; a reaction to medication; leukemia; allergic reaction; stress; or smoking, as stated by Mayo Clinic. Tube... More »

A high white blood cell count affects the ability to donate blood, since it is a sign of infection, disease, drug reaction or immune system disorder that must be resolved before donating, state Mayo Clinic and the Americ... More »

A high white blood cell count may indicate anemia, infection, allergic reaction or leukemia, states MedlinePlus. Other causes include extensive tissue damage, cigarette smoking and severe mental or physical stress. Takin... More » Health Medical Ranges & Levels

A high white blood cell count in the urine is often a sign of an infection, states WebMD. The presence of either nitrites or leukocyte esterase means that when the lab examines the urine sample under a microscope, more w... More »

In adults, a white blood cell count of over 11,000 white blood cells per microliter of blood is typically considered high, although normal ranges vary from practice to practice, states Mayo Clinic. The normal range is 4,... More »