The nurse is reviewing the medical record of a pediatric client suspected to have acute glomerulonephritis. What finding should the nurse expect to note in a client with this diagnosis?

The correct answer is C: Positive antistreptolysin O titer. Acute glomerulonephritis is often triggered by a preceding streptococcal infection. A positive antistreptolysin O titer indicates recent streptococcal infection, supporting the diagnosis. Decreased urine specific gravity (choice A) is not typical in acute glomerulonephritis which often presents with oliguria and proteinuria. Hypotension (choice B) is not a common finding in acute glomerulonephritis, as hypertension is more prevalent due to fluid retention. Low blood urea nitrogen and creatinine (choice D) are not expected findings in acute glomerulonephritis, as renal impairment typically results in elevated levels of these markers.