A nurse is reviewing the laboratory results of a child who was recently admitted for suspected rheumatic fever.The nurse should identify that which of the following laboratory tests can contribute to confirming this diagnosis? Select all that apply.

The correct answers are Choice A, Choice D, and Choice E.Choice A rationaleAntistreptolysin O (ASO) titer is a blood test used to detect antibodies against streptolysin O, a substance produced by group A Streptococcus bacteria. Elevated ASO titers indicate a recent streptococcal infection, which is a common precursor to rheumatic fever.Choice B rationalePartial thromboplastin time (PTT) measures the time it takes for blood to clot and is used to evaluate bleeding disorders. It is not relevant for diagnosing rheumatic fever, which is an inflammatory disease.Choice C rationaleBlood urea nitrogen (BUN) measures kidney function and is not used to diagnose rheumatic fever. Rheumatic fever is diagnosed based on evidence of a preceding streptococcal infection and clinical criteria.Choice D rationaleErythrocyte sedimentation rate (ESR) is a blood test that measures inflammation in the body. Elevated ESR levels are one of the minor criteria for diagnosing rheumatic fever, indicating the presence of inflammation.Choice E rationaleC-reactive protein (CRP) is another marker of inflammation. Elevated CRP levels are also one of the minor criteria for diagnosing rheumatic fever, reflecting the inflammatory response in the body.