Skip to Content
Home > Wellness > Health Library > Rh Factor
The surface of red blood cells contains markers that the immune
system can recognize—one of these markers is the Rh factor (Rh [D] antigen). A
person whose blood contains the Rh factor is Rh-positive (D); a person whose
blood does not contain the Rh factor is Rh-negative (d).
Blood type contains information about the presence (+) or absence
(–) of the Rh factor. Blood type is indicated by a letter (A, B, or O) and a
symbol (+ or –). If a person has B negative (B–) blood, for example, that
person is Rh-negative. A person with B positive blood (B+) is
Current as of:
May 22, 2015
Sarah Marshall, MD - Family Medicine & William Gilbert, MD - Maternal and Fetal Medicine
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.
I Want To...
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.