ABO incompatibility is treated by controlling the jaundice and anemia it causes, most often with frequent feeding and phototherapy, and only rarely with IV immune globulin or an exchange transfusion.
The treatment level depends on the baby's bilirubin number, age in hours, and how fast the level is rising, not on the blood types alone. Most babies with a type O mother and type A or B blood never need anything beyond routine feeding and a bilirubin check. Babies who do need phototherapy typically improve within a day or two, and many go home with a plan for a repeat bilirubin or blood count, since anemia can show up in the first few weeks. Feeding 8 to 12 times a day helps clear bilirubin through stool, so tell your care team if feeding is going poorly or if wet diapers drop off. ABO incompatibility during a blood transfusion is a separate emergency and is handled by stopping the transfusion immediately.
What treatment looks like
Common questions
How is ABO incompatibility treated?
Treatment depends on how much red blood cell breakdown is happening. In a newborn whose blood type differs from the mother's, care focuses on bilirubin: frequent feeding, bilirubin testing by blood draw or skin meter, and phototherapy if the level crosses the treatment threshold for the baby's age in hours. Higher or fast-rising levels may be treated with IV immune globulin, and an exchange transfusion is reserved for severe cases. Anemia can develop over the first few weeks, so a follow-up blood count is common. An ABO-incompatible blood transfusion in an adult is different: the transfusion is stopped at once and emergency care begins.