Question: what abo agglutinins are present in the plasma?
Answer: The ABO group of a person depends on whether his/her red blood cells contain one, both, or neither of the 2 blood group antigens A and B. There are, therefore, 4 main ABO groups: A, B, AB and O. Antibodies (agglutinins) for the antigens A and B exist in the plasma and these are termed anti-A and anti-B.