A member asked:

Can all blood types contain rh factor?

5 doctors weighed in across 2 answers
Dr. Michael P Vaughn answered

Specializes in Allergy and Immunology

No: There are multiple types of rh factors that are present on the surface of blood cells however; many people do not have these antigens and they are called rh negative. Blood transfusions and organ transplants are matched for rh factors between donors and recipients.

Answered 11/28/2011

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Yes: All blood types, whether a, b, ab, or o can be rh positive or negative. Written a+ or a-, b+ or b-, o+ or o-, etc.

Answered 8/16/2013

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