Which statement about the antiglobulin reagent is true?

• A. It may be produced in laboratory animals
• B. It cannot be produced in animals
• C. It must be derived from humans
• D. It is only used in transfusion medicine

Answer: (A)

The antiglobulin reagent is produced to bind human immunoglobulin or complement bound to red cells, enabling detection of antibodies in the Coombs tests. This reagent is typically generated by immunizing laboratory animals (such as rabbits or goats) with human immunoglobulin or related antigens, producing antibodies against human IgG and/or C3. The resulting antisera or purified antibodies are then prepared as the antiglobulin reagent used in direct and indirect Coombs testing. Because animals can be repeatedly immunized and yield large quantities of specific anti-human globulin, producing this reagent in laboratory animals is standard practice. It isn’t limited to human-derived material, and its use extends beyond transfusion medicine to other immunohematology applications and research.