Question: what is the difference between blood group positive and negative?
Answer: Within the ABO system, people can be one of four groups: O, A, B, or AB; with respect to Rh a person is either positive or negative. This creates a total of eight main blood types. ... Those who have this "Rhesus" factor on their red blood cells are considered Rh positive. Those who lack the factor are called Rh negative.