Skip to Content
Home > Wellness > Health Library > Hematocrit
Hematocrit is a measure of how much space (volume) the red blood
cells take up in the blood. A hematocrit check is often used to test for
anemia, which is a decrease in the amount of oxygen-carrying substance
(hemoglobin) found in red blood cells.
The hematocrit value may be given as a percentage of red blood
cells in a volume of blood. For example, a hematocrit of 33 means that 33% of
the blood's volume is composed of red cells. It may also be measured in
milliliters per deciliter (mL/dL) of blood.
Current as of:
September 9, 2014
E. Gregory Thompson, MD - Internal Medicine & Joseph O'Donnell, MD - Hematology, Oncology
How this information was developed to help you make better health decisions.
To learn more, 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.