Skip to Content
Home > Wellness > Health Library > Platelet
A platelet is the smallest type of blood cell. Platelets are the
body's first defense against bleeding, helping the blood to clot (coagulate) by
collecting at the site of a wound and clumping together to help stop the flow
People with very low levels of platelets or who have bleeding disorders
may need to have transfusions of platelets to prevent excessive
Current as of:
August 21, 2015
E. Gregory Thompson, MD - Internal Medicine & Joseph O'Donnell, MD - Hematology, Oncology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.