A delayed hemolytic transfusion reaction due to anti-Cob

Area of Science:

• Hematology
• Transfusion Medicine
• Immunology

Background:

• Sickle cell disease (SCD) patients often require multiple blood transfusions.
• Transfusions in SCD patients carry risks, including alloimmunization and transfusion reactions.
• Primigravida women with SCD are a specific population with unique transfusion considerations.

Observation:

• A primigravida woman with SCD developed a delayed hemolytic transfusion reaction.
• The reaction manifested 16 days post-transfusion with a drop in hemoglobin.
• Newly positive antibody screen and direct antiglobulin test were observed.

Findings:

• The specific antibody identified was anti-Cob.
• Anti-Cob was detected in both the patient's serum and red cell eluate.
• This indicates an immune response against the Cob antigen on transfused red cells.

Implications:

• Delayed hemolytic transfusion reactions can be caused by less common antibodies like anti-Cob.
• Careful antibody screening and identification are crucial in multiply transfused patients, especially those with SCD.
• Understanding antibody specificities is vital for preventing future transfusion reactions and managing patients with SCD.