A client is donating blood for a family member who is having surgery. The nurse tells the client that an indirect Coombs' test will be performed on the blood. The client asks the nurse about the purpose of the test. Which response should the nurse provide to the client? 1."The test detects the presence of hepatitis B virus." 2."The test detects the amount of hemoglobin in the blood." 3."The test detects circulating antibodies against red blood cells (RBCs)." 4."The test detects the presence of human immunodeficiency virus (HIV)."

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