A young child presented with history of passage of dark colored with urine with reduced urine output. He has a past history of abdominal pain, fever, and bloody diarrhea for 4 days which resolved on its own. There is absence of peripheral edema or rashes. Investigations show anemia, thrombocytopenia, and elevated blood urea nitrogen and serum creatinine. Which of the following findings is most expected finding in this patient?