AB- is the rarest of the commonly recognized blood types, though the extremely rare Rh-null type is the rarest of all blood types. A blood type is considered rare when fewer than one in 1,000 people carry it. More »

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The rarest blood group in the United Kingdom is AB, and as only 15 percent of people are Rhesus (Rh) negative, the rarest type overall is AB negative. The type of blood a person inherits depends on their parents' genetic... More »

AB negative is the rarest type of blood due to the genetic factors that affect blood type, according to the Red Cross. In order for a child to be born with AB type blood, one of his parents must have AB blood. Less than ... More »

The blood types and their global prevalence are A+ at 28.3 percent, A- at 3.5 percent, B+ at 20.6 percent, B- at 1.4 percent, AB+ at 5.1 percent, AB- at 0.5 percent, O+ at 36.4 percent and O- at 4.3 percent. The rarity o... More »

www.reference.com Science Human Anatomy Blood

According to the School of Nursing and Academic Division of Midwifery at the University of Nottingham, hydrostatic pressure is a type of pressure that is exerted by the blood onto the capillary walls in humans. As blood ... More »

The eight blood types are A, B, AB and O, each of which can occur as a positive or negative type. The most common blood type is O positive, while the rarest blood type is AB negative. More »

Of the eight different common blood types, AB negative is the least common blood type in the United States, according to the American Red Cross. O positive is the most common type, followed by A positive as the second mo... More »