The spleen is an organ in the upper left side of the abdomen. It
filters the blood by removing old or damaged blood cells and platelets. It also
helps the immune system by destroying bacteria and other foreign substances.
The spleen holds extra blood that can be released into the circulatory system
Primary Medical Reviewer
E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer
W. David Colby IV, MSc, MD, FRCPC - Infectious Disease
How this information was developed to help you make better health decisions.