Hospitals are seeing a shift in the causes of hemolytic disease of the fetus and newborn (HDFN), with minor blood groupBlood group A classification of blood based on inherited markers found on red blood cells. The ABO and Rh blood groups are most common in HDFN. incompatibilities such as anti-c antibodiesAntibody A protein made by the immune system that recognizes and attacks foreign substances, such as bacteria, or in HDFN, fetal red blood cells carrying incompatible antigens. emerging as important culprits even when there is no ABO or RhRh factor A protein or antigen found on red blood cells. When an Rh-negative mother carries an Rh-positive fetus, her immune system may make antibodies that attack the fetus' red blood cells.(D) mismatch, as illustrated by a case report published recently in the Global Journal for Research Analysis.
This case highlights the risk for newborns when these less common blood group antibodies cross the placenta and destroy fetal red blood cells, leading to severe jaundiceJaundice A common symptom of HDFN, jaundice is caused by excess bilirubin and is characterized by a yellow tint to the skin or eyes. and anemiaAnemia A condition that occurs when the body doesn’t have enough healthy red blood cells to carry oxygen to its tissues. In HDFN, anemia occurs when maternal antibodies destroy fetal red blood cells.. For patients, this means that even with modern prevention for Rh(D) disease, doctors must remain vigilant for other blood group issues to keep babies safe.
“To mitigate preventable neonatal morbidity and mortality, comprehensive red cell antigen phenotyping and extended antibodyAntibody A protein made by the immune system that recognizes and attacks foreign substances, such as bacteria, or in HDFN, fetal red blood cells carrying incompatible antigens. screening should be prioritized in antenatal care, particularly for women with a history of chronic transfusions,” explained the study’s authors. “Early identification enables closer fetal monitoring, timely interventions, and optimized neonatal outcomes in high-risk pregnancies complicated by alloimmunizationAlloimmunization When a person’s immune system develops antibodies against foreign antigens from the same species—such as when an Rh-negative mother’s body forms antibodies against her baby’s Rh-positive red blood cells..”
A full-term baby boy developed severe jaundice within hours of birth despite having no ABO or Rh(D) incompatibility with his mother. The mother, who had sickle cell disease, had received multiple blood transfusions before and during pregnancy, increasing the risk of developing anti-c antibodies. At just 10 hours old, the newborn’s bilirubinBilirubin A yellow substance produced when red blood cells break down. High bilirubin levels in newborns with HDFN can cause jaundice or, in severe cases, brain damage. was already 10.8 mg/dL, prompting intensive phototherapyPhototherapy A treatment that uses special blue light to help newborns break down bilirubin and prevent kernicterus. in the neonatal intensive care unit.
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As the baby’s condition worsened, his bilirubin climbed to 19.5 mg/dL at 16 hours of life, and his hemoglobin dropped, showing active red blood cell destruction. Doctors performed an emergency double volume exchange transfusion to replace his blood and remove antibodies. Despite this, bilirubin remained high, requiring a second exchange transfusion at 72 hours. Further testing confirmed the mother’s anti-c antibodies were responsible for the hemolytic disease.
Unlike ABO incompatibility, Rh-mediated HDFN, especially from minor antigensAntibody A protein made by the immune system that recognizes and attacks foreign substances, such as bacteria, or in HDFN, fetal red blood cells carrying incompatible antigens. such as c, can be more severe and worsen with each sensitizedSensitization The process by which a mother’s immune system becomes “primed” to recognize and attack fetal red blood cells carrying incompatible antigens. pregnancy. Anti-c is the second most common cause of Rh-related HDFN after anti-D and can lead to life-threatening complications if unrecognized. Other Rh antigens such as C, E and e may also trigger similar reactions, though less often.
This case underscores the importance of thorough antenatal screening, particularly for mothers with conditions such as sickle cell disease who often need multiple transfusions. For these patients, extended blood group typing and antibody screening can help detect hidden risks. Identifying these incompatibilities early allows doctors to plan interventions, reducing the need for emergency treatments after birth.
Patients and families should know that while prevention with anti-D immunoglobulinIntravenous immunoglobulin A therapy made from donated antibodies that may help reduce the mother’s immune response and protect the fetus. has greatly reduced Rh(D) disease, other blood group mismatches still pose a threat. By working closely with their healthcare team, mothers with higher transfusion needs can help ensure the best outcomes for their babies through timely testing and careful monitoring.
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