isoagglutinin
/ˌaɪsoʊəˈɡluːtɪnɪn/
noun
- An antibody that causes the clumping of red blood cells from another individual of the same species.
- The presence of isoagglutinins in the plasma determines a person's blood type.
- A blood test can measure the level of isoagglutinins in a patient's serum.
- Isoagglutinins are naturally occurring antibodies that react with A or B antigens.