Why is blood group identification not required for transfusing serum?

Explanation

**Step-by-Step Solution:**

1. **Understanding Serum**: Serum is the liquid component of blood that is obtained after the blood has clotted and the cells (RBCs, WBCs, and platelets) have been removed. It contains water, electrolytes, proteins, hormones, and waste products.

2. **Components of Blood**: Blood consists of various components, including red blood cells (RBCs), white blood cells (WBCs), platelets, and plasma. The blood group antigens, which determine an individual's blood type (like A, B, AB, or O), are located on the surface of the RBCs.

3. **Absence of Antigens in Serum**: Since serum does not contain RBCs, it also does not contain the blood group antigens. This means that there are no antigens present that could trigger an immune response in the recipient.

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