A Case Report on the Detection of Anti-M Antibodies in a Pediatric Patient With Pneumonia.

Blood group antibodies can pose serious challenges during transfusion, especially in pediatric patients, where immune responses may be unpredictable. Early identification of alloantibodies helps guide safe transfusion practices. We present the case of an 18-month-old female patient diagnosed with pneumonia, in whom an anti-M antibody was detected during pre-transfusion testing. The patient, admitted to Guru Gobind Singh Government Hospital in Jamnagar, India, in January 2025, required a blood transfusion due to severe anemia (hemoglobin 7.1 g/dL). Serological testing revealed a positive antibody screen with anti-M antibody identified via three-cell and 11-cell panels. This case highlights the importance of advanced serological testing in pediatric patients requiring transfusion, particularly those with underlying infections like pneumonia, which may complicate transfusion management.