What is the characteristic presentation of a delayed hemolytic reaction to blood transfusion occurring 3 days post-transfusion?

• A. Fever and headache
• B. Jaundice and no fever
• C. Rash and itching
• D. Chest pain and back pain

Answer: (B)

A delayed hemolytic reaction typically occurs several days to weeks after a blood transfusion, often between 3 to 10 days post-transfusion. The hallmark of this type of reaction is the gradual destruction of red blood cells, which can lead to a rise in bilirubin levels. This rise in bilirubin is primarily due to the breakdown of transfused red blood cells, leading to jaundice, which manifests as yellowing of the skin and sclera.

In a delayed hemolytic reaction, fever is usually absent or minimal because the immune response is less acute compared to immediate reactions. Patients may also not experience significant systemic symptoms such as chills or hypotension commonly seen in acute transfusion reactions. Given this context, jaundice appearing without a fever is consistent with the characteristic presentation of a delayed hemolytic reaction.

The other options present symptoms typically associated with other types of reactions. Fever and headache might indicate an acute hemolytic reaction but are not characteristic of delayed reactions. Rash and itching could suggest allergic responses or transfusion-related acute lung injury, while chest pain and back pain are typical of acute hemolytic reactions rather than delayed ones. Therefore, the presence of jaundice without fever strongly points to a delayed hemolytic reaction.