Find over 200 print-friendly fact sheets about heart disease and related health topics.
Find definitions for thousands of medical terms, treatments, and tests -- even health-related abbreviations, prefixes, and suffixes.
White blood cells are made in the bone marrow and protect the
body against infection. If an infection develops, white blood cells attack and
destroy the bacteria, virus, or other organism causing it.
blood cells are bigger than red blood cells and normally are fewer in number.
When a person has a bacterial infection, the number of white cells can increase
The white blood cell count shows the number of white
blood cells in a sample of blood. A normal white blood cell count is between
4,500 and 11,000 cells per cubic millimeter (4.5 and 11.0 x
109 cells per liter). The number of white blood
cells is sometimes used to identify an infection or to monitor the body's
response to treatment.
There are five types of white blood cells:
lymphocytes, monocytes, neutrophils, basophils, and eosinophils.
December 14, 2012
E. Gregory Thompson, MD - Internal Medicine & Brian Leber, MDCM, FRCPC - Hematology
White-coat (or office) hypertension refers to blood pressure that
rises above its usual level when it is measured in a clinic setting, such as a
doctor's office, where a nurse or doctor may be wearing a white lab coat.
White-coat hypertension is more common in people who have high
blood pressure than it is in people who have normal blood pressure. It tends to
decrease with repeat measurements.
April 5, 2011
E. Gregory Thompson, MD - Internal Medicine & Robert A. Kloner, MD, PhD - Cardiology