O Rh Negative - Pitta predominant - 70% of the time
A - Vata predominant - 80% of the time
B - Kapha predominant - 80% of the time
AB - Vata Kapha dual - 65% of the time
Remember, blood in the Western sense includes rasa and rakta dhatus. A blood transfusion of the component called red blood cells, which is rakta dhatu, is required when a person has an extremely low blood count and is also necessary during a surgical procedure. Type A receives blood from A. Type B should receive blood from type B. The universal donor is O and the universal recipient is AB. These four groups are important. It is simple to have your blood type checked in a lab. If by mistake blood if Type A is given to B or B to A, it is a mismatch. In addition, we must think about Rh positive and Rh negative. O Rh negative is highly Pitta, and these people may develop peptic ulcer, ulcerative colitis and other pitta disorders. This group is likely to develop disorders of increased ranjanka pitta.
From “The Textbook of Ayurveda Fundamental Principles” by Dr. Vasant Lad, pg 120 http://www.ayurveda.com/products/books.html#textbook