A nurse is preparing to administer a unit of packed red blood cells (PRBCs) to a client with severe anemia. Before starting the blood transfusion, the nurse should:

A) Incorrect: Discontinuing the blood transfusion may be necessary if the allergic reaction is severe, but it is not the appropriate action for a mild allergic reaction. The nurse should manage the current reaction and take preventive measures for future transfusions.

B) Incorrect: Administering an antihistamine is appropriate to manage the current allergic reaction,but it may not prevent future allergic reactions. The nurse should focus on preventing allergic reactions in future transfusions.

C) Incorrect: Notifying the healthcare provider is important for appropriate management, but it may not directly prevent future allergic reactions. The nurse should implement preventive measures.

D) Correct: Obtaining a sample for repeat crossmatching is essential to identify and select blood products that are less likely to cause an allergic reaction in the client. This step can help prevent future allergic transfusion reactions and ensure safer blood product selection.

A) Incorrect: Confirming the client's identity and blood type with the client's family member is not a reliable method for ensuring patient safety during a blood transfusion. The nurse should directly verify the client's identity and blood type with two unique identifiers, such as asking the client to state their full name and date of birth and comparing it to their identification band.

B) Correct: Obtaining informed consent from the client is a crucial step before initiating a blood transfusion. The nurse must ensure the client understands the risks and benefits of the transfusion and has willingly provided consent. A signed consent form is the formal documentation of this process.

C) Incorrect: Warming blood in a microwave oven is not an appropriate method for preventing hypothermia and can lead to hemolysis of the blood components. Blood should be warmed using an approved blood warmer designed for this purpose.

D) Incorrect: Administering a rapid bolus of normal saline is unnecessary and could lead to fluid overload in the client. The nurse should administer normal saline or another appropriate IV fluid at the prescribed rate if the client requires hydration before or after the transfusion, but not as a priming method.