| ABO | Three Main Blood Types |
|---|---|
| ABO | abortion; absent bed occupancy; American Board of Orthodontists; blood group system consisting of gr... |
| OAB | ABO blood group; old age benefits |
| AFP | Alpha(α) Feto-Protein [HP 1826, 1858, 1859, 2265] ; Oncofetal Antigens &nbs... |
| Anti-ENA | Anti-Extractable Nuclear Antigens |